Malicious PDF — malware analysis report

Static analysis result for SHA-256 9306fc2f8cba48bd…

MALICIOUS

PDF

87.2 KB Created: 2021-07-05 13:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e29ac561b526ac4e1e127393406f5d9a SHA-1: 617b8f8fb4282408247fe36fa1081bc119750a0f SHA-256: 9306fc2f8cba48bde55d3755ddaca086aec0db830c6876d1994959e95cf4dd7d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in tech support scams or callback phishing operations. The presence of numerous links to potentially compromised WordPress sites and disposable hosting further supports a malicious intent, likely to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bacd0686410---moronuxonem.pdf In PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae44d0be5b9---vabitapideragezovidema.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/99014472542.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/22002239002.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/2008698467.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/da777448bffa52fa877ceff19ea44dd7/56120987677.pdfIn PDF document text
    • http://dnepropress.net/files/file/50901227428.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084d8a94cef3---81497766489.pdfIn PDF document text
    • http://onlineexpert.in/userfiles/file/70576183337.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/wezezu.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/xapewubikano.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160768a81528f4---litulorera.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/xosutomewugaxibigogubu.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd64e3bbe37---xotusogakadikogumi.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/47177778358.pdfIn PDF document text
    • http://jfk1969nola.com/clients/873000/File/90880693040.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/butid.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/ot3vr4f52kuollrg7jn3u1dfkp/98905574610.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/60847478161.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/buxiwurozifewoporeruriwur.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/39601903684.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/5472e5ecb0bbed49100d55a3970eb066/niruziwumasolo.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/b5b97264ddd618f845aefcb2ad67905f/65619196490.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+find+out+pdf+passwordPDF 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_off0000f200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF200 10488 bytes
SHA-256: f6b7135804611497d586c246ccdefb3e35ea69b0ae3295a3709a343bf0f59a3c
font_01_sfnt_off000109f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001220a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220A 17376 bytes
SHA-256: b3125b4c2c570fff7098eb6d35aa703795657aa5706e5f6bfbdf800bda7d1bce

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