Malicious PDF — malware analysis report

Static analysis result for SHA-256 f326583a52e9e9af…

MALICIOUS

PDF

87.8 KB Created: 2021-09-02 06:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ab55b3ed59db061c82588280e4b35197 SHA-1: 5f1c8167946a76bb9086be6cd7b6dcf8ff5a8515 SHA-256: f326583a52e9e9af63fb5e03aad5bce08a1d89bcca9ea94a2a8427ab86c3bc04
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting it is part of a link farm designed to host malicious content or redirect users. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in callback phishing and tech-support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://irlanc.ru/uplcv?utm_term=phone+number+for+the+department+of+public+safety PDF link annotation
    • http://bioident.pl/photos_fck/file/58334626465.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fbe561b02---42744219190.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d3924b143dd---97142563099.pdfIn PDF document text
    • https://curvy.tw/upload/files/82226040266.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8e903670a---80943909376.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/20391204032.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/a3824b7eeda35832d05ceb2e0c7a000b/bajafuwofufipowesotol.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/dopeliki.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608561e96852d---96360269288.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/pekaven.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/c0ep5eek9dk6l6btpuub4nribl/logogabutowomizilag.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/77039701757.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/jowatezabutodibu.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/bipirunumaxutego.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/tejelotuvurowemijewi.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/163036540938431353912.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/38801715698.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/2d04399d4b3f8a8f754334887478f778/3182773764.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/77723120227.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089daa1e1d4d---vejilusivupew.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/xemufulade.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a11763257---tidudexavulavozet.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/91772724201.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/nigoga.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_off0000ef1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10731 11240 bytes
SHA-256: 20e189cca65174bdf029ed587acf176173ea2acccbfbc6bb355aa705e6438eb7
font_02_sfnt_off0001211d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211D 18396 bytes
SHA-256: 9d442b1e86a2e7747c3b0d530875de711ef716debd4a4443687e2e7f3c1f378e

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