Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c58aaf940a4132…

MALICIOUS

PDF

97.1 KB Created: 2021-08-07 06:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7b251423bad8c83b13900c4732be718b SHA-1: 2793f2bf59deeb98fce89c300373b0ff3bea209b SHA-256: d8c58aaf940a4132b79ae5970f53ec0f1115bc2731df72f28203c7c92af5b729
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious intent, including links to compromised CMS uploads and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest this is a malicious PDF, likely used for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://ambulatorioveterinariovianello.eu/userfiles/files/54924822319.pdf In PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e36ddac3d---1913608032.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/5eb2dcd2784d6cff6bb582e0020bc6a9/45255565901.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///zaxapowegojimi.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/nk4lfrnrolea1bgg1kbs8u1od6/84595056634.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16085e2da7ec30---74370373162.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/jirateladefawozuxere.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/jadogudateramuwo.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/75894787300.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/ffd9adb25abfb035602d5e6af76a3452/97530972959.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/97009669a4efbb8a3c57323e71177d50/87909779888.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b29a5fb8238---97665038729.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/578800a5f7fc9a8533ba3d8dc6ee7638/xevefunagafoxifofuj.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/27l4hoifi1c39aa995ggqgnh7t/nivolidagefejanizimuvumo.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/38211476608.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/zisurif.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/48386693227.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/zamiruvuzufewuxo.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/nagilotoxut.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/1103124638.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/wusixovemoneniw.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/3eoh28dbidb8gt3l00qucq77b0/6405913060.pdfIn PDF document text
    • http://capital96.com/userfiles/file/41901792625.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3089d0055---29985000000.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=jcr+impact+factor+2020+excelPDF 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
font_00_sfnt_off00010ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADE 18408 bytes
SHA-256: e1a468b747baa3d7c94b3b0d040ed498e6d541d94fa106a86ef3906a83c21687
font_01_sfnt_off00013aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000152fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152FB 2424 bytes
SHA-256: 1df4570df11766137d8c7bf9b16e7fd30bb59acecc295e0d7d596f5e1276a841
font_03_sfnt_off00015d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D97 10704 bytes
SHA-256: 6014f9259ccbd7471b144b4e3deda63905975352049472bcaad87c5c6d7d9bc7

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