Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4a31200cf4f401…

MALICIOUS

PDF

94.8 KB Created: 2021-09-02 23:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9f27c90137cc7de34329b0c513e865e4 SHA-1: 03d2d071fa8e2e3d97a21157921fdeefbac23712 SHA-256: 4c4a31200cf4f401da8a654bba23be8130c3c2122d68010ee716ec541d6379ec
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a callback phishing or tech-support scam. It contains numerous external URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting an attempt to distribute malicious content or redirect users. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, and the presence of embedded JavaScript (T1059.007) suggests potential for further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://krisoc.ru/uplcv?utm_term=imperva+securesphere+v12+0+administration+guide+pdf PDF link annotation
    • http://jdjcnc.com/upfolder/e/files/20210828165015.pdfIn PDF document text
    • http://byecook.com/ckupload/files/93545656884.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/2283643683.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a424cd2969---13078996362.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/aad788f6baf5fa925744984c0a58947d/pilaxedodavanepolazuj.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/fb32d20816a05676ab626c63fb776fa4/77819010713.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc09c55976f---30413412511.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/ladilo.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/55267554750.pdfIn PDF document text
    • http://rc-modeller.se/images/file///65470599784.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/mmh30sjscouvhu1u834abaigu0/69864598146.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/15664213134.pdfIn PDF document text
    • https://denimder.org/resimler/files/68912907492.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d1a454aaf---tixulixexumoge.pdfIn PDF document text
    • http://dogable.de/userfiles/file/firozukik.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc498e42797---kuxafar.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/wofubumexemizab.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05d98311b3---3530250561.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/zubarexifaxip.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/jopeka.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/nofodigulijegutaxonite.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/99496943650.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8be6f20b4---28049254153.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001080e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12025 11432 bytes
SHA-256: af7b8405eddc0d6b322050c70ec6b97dbcced824d539f60fac48f01785c0f723
font_02_sfnt_off00013ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD9 19340 bytes
SHA-256: 3f17637c1dce96f5faad9136b1a301c2e33d761161e00332afd56962b0760af1

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