Malicious PDF — malware analysis report

Static analysis result for SHA-256 be64627458afd64a…

MALICIOUS

PDF

95.9 KB Created: 2021-08-02 04:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 17803b06beeccfa4d919cc5b6411ee1d SHA-1: 2c05bd7cd8fd04fec9fde055b4d04f962aca2c1a SHA-256: be64627458afd64a6534baf1f233b35ef099c8bcd6241216da27906143919237
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating malicious intent, including links to compromised CMS uploads and a lure for MFA or callback phishing. The ML classifier strongly flags this PDF as malicious. The presence of external links suggests an attempt to redirect the user to a second-stage payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcad8350d6f---pibekifipolaga.pdf In PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf9dd70a79---65576028753.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/9l780it9inlsjepo4jc54p55c7/gagipidikemovorumetex.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/gp45f4lgfaj4m9kpoqeofu642u/dimulunevaxuvuvobawemeri.pdfIn PDF document text
    • https://faceless.me/userfiles/files/tasokaxerajipas.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160743849caa5e---10986075514.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/55877829679.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162221340538.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/388d38f0601866920ea836028db81c48/rapijinilosojilog.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/80410322328.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/ranoz.pdfIn PDF document text
    • http://d4squebec.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/fowefusinoferufemu.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/devobolijasodipi.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a120c1c1e---11673726350.pdfIn PDF document text
    • http://accronline.com/userfiles/file/sefaf.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160845de0bfaf8---lowofiratetuxatilagopu.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c97d5b877---63991351989.pdfIn PDF document text
    • http://pinxedien.net/upload/files/73350460204.pdfIn PDF document text
    • http://tw-go.org/files/99938599102.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/pindhfoddkerqbp90tbt37rq86/nigugitijis.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f25254081---zogewejafozelotem.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/1po5qfhnvemsqlkc6tnibpiiq7/71733670040.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/03f785487003aa3ebc87298a9251df3d/25369202040.pdfIn PDF document text
    • http://skikk.be/app/webroot/files/userfiles/files/jomosinujuximubaw.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/99692431576.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa24979844c---jomugaronagebabere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=samsung+mobile+master+reset+passwordPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off0001536e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1536E 18428 bytes
SHA-256: eb0d731df869a4823baafa9dd22e5a9888232afe0088bcd8546275c0f598dd72
font_00_sfnt_off0000f291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF291 11136 bytes
SHA-256: b72bb9b226c4c12cd38edeaba6ca54b69e1d09c256d1f81c2532c88f42a0a3c9
font_01_sfnt_off00010c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C27 17820 bytes
SHA-256: dd32faa708d75e5dd435afff9a885cf34e03292aa5ac00be0474602df945de8c
font_02_sfnt_off00013b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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