Malicious PDF — malware analysis report

Static analysis result for SHA-256 82071d2fefbec551…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 02:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 760facd15e389a96b17b7b5f30507564 SHA-1: 8da4b55055a7be54918a2a118f1f3250fc0e3a0a SHA-256: 82071d2fefbec5513ef7f57c790d00c5e564c00ef416dd1c218c3d287ce1e1fb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing lure. The document body is heavily obfuscated, but heuristics indicate it is a link farm pointing to various PDF files hosted on compromised CMS uploads and disposable domains. The presence of embedded URLs and the nature of the heuristics suggest an attempt to direct users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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 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 https://vibingvibes.com/userfiles/files/bezemanimepitijuz.pdf In PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/75095507740.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/81152833512.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/21090113520646062082je89.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/8a32c445f596c930d7c89e444f742f33/74270754612.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/db0c00773a1f31bd3c7b19ca895affdb/duzese.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/7781625034.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/fewepozegalexezajuzawe.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/73669496328.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109120442569778.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/74239388397.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/tituxolika.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/43865004037.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/jopitibasikarolokom.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/dosovowelerenimof.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/dunudusesevaxamera.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/13989272048.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/bopuxaju.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386373d01b8---wipapagiwivupawipi.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/welozegizumupaz.pdfIn PDF document text
    • http://coolscape.info/images/files/jisule.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/tupanetezesadu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=earn+to+die+2017PDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE945 10352 bytes
SHA-256: bb5c3d641ce5fb6651c588f1c19713d48608aab31a1054f408e3c171ed5404e0
font_02_sfnt_off000100dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DD 22420 bytes
SHA-256: 3b6b891f41e43eae528eac777c2d93d61c3cf90ed35a85827d22485e54dd8602

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