Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b6d8127cb847f4…

MALICIOUS

PDF

84.3 KB Created: 2021-08-24 18:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1d40e1f10e284474c0faf8153a79176f SHA-1: da9a63bda22c48130148b7a2e89817b3607871bf SHA-256: f4b6d8127cb847f467ff4a25ee1d599ec3afca7894c146ab1c4a44de1f12ddc2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload storage, suggesting it is part of a link farm designed to host malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in phishing and tech-support scams. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards a malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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 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://allytemp.ru/uplcv?utm_term=mustang+gt+for+sale+manual PDF link annotation
    • http://parilka.by/var/upload/file/29927448167.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/19977744367.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/atcvrk20ei6gfilr67g97ifln2/14380887574.pdfIn PDF document text
    • http://lawngo.net/fckfiles/58874784762.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bafe95ac1b9---logaroruganeroxok.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/femegovuxos.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eadc4d557b---10929240464.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/21136172804.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/soxotigojutiv.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/tanivebikegomer.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0525a4d9e7---89837270571.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/79929073354.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd29ee5803---36659131934.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/ae8uloqol22467gq35i0phus5k/83099489718.pdfIn PDF document text
    • http://dejede.com/userfiles/file/23356889102.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/1c9d4e9f61e9860d81886f4e05a33589/92222365705.pdfIn PDF document text
    • http://szhlfz.net/upload/8262617570.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d79a578e46---vodopedinigofes.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/75f9ef4cb0f7b70f47ea0f5bcaee21a5/26744027083.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/godiju.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/mepelajiromajabizaz.pdfIn PDF document text
    • http://cy2hand.com/userfiles/vodajiruxupep.pdfIn PDF document text
    • http://farmina.ru/uploads/files/79960293086.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/88415528173.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/48560063511.pdfIn PDF document text
    • 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_off0000cd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE528 17092 bytes
SHA-256: 1491343fc609a54c4a9f4694e846119831451954e7f1f159244d96498fba40e8
font_02_sfnt_off000111cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CC 10556 bytes
SHA-256: 5159b82569de1e36673e45f53140bf52964cfd78b1dfc4953c22b5ae3037a09b
font_03_sfnt_off000129e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E5 16396 bytes
SHA-256: bb0ceb67038548fc4b47a69ec5838f0634b766bb8c73405cdbd088fbf7e0a0ca

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