Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33bba8403a2c056…

MALICIOUS

PDF

88.0 KB Created: 2021-07-03 14:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a78d35bc49d017de26623439b0910c0 SHA-1: d6182f61d7a6bf5a8b24721a1e7bad957f7a581d SHA-256: a33bba8403a2c056b3bea048bae5f228d004c0b08551fc6805fab577b4991409
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is classified as malicious by ML models and ClamAV, exhibiting characteristics of a callback phishing or tech-support scam. It contains numerous links to disposable hosting and compromised CMS uploads, suggesting an attempt to host malicious content or redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it is designed to deceive users into initiating contact, likely to extract sensitive information or financial details.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd15d2a612e---luwuvane.pdf
    • https://ndmoyun.com/calisma2/files/uploads/23776551315.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c212c3567c8---54691754431.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/j4tvdt5hid4cg4qjk9uodn9nc5/94245521957.pdf
    • http://cementfeet.com/userfiles/file/8627597411.pdf
    • http://ferrogep99.hu/static/media/file/satexelewewetuv.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b685c6e2930---diboveporafavosakaboja.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/df9b01724860aed74a869abef06e6534/2601413460.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160be6a8240275---41221158054.pdf
    • http://msiutilities.biz/documents/janexepogi.pdf
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/0823b631fd785f93ef120629f3dbb7ae/84410003785.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7ebe50c77---laponukovudop.pdf
    • http://zaun-produzent.de/userfiles/file/binotobodas.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac38fe650e9---korekonu.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/lkha1fdcop53t6lobph21uo57d/meburumekixidinumu.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe3bec93a4---kesojeguxibagab.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/pkebfneri8iormfbofdtmocuuh/54920236541.pdf
    • http://aircond.md/upload_fck/file/11702135822.pdf
    • https://ssvacancy.com/ckfinder/userfiles/files/naxetavepojebakudukavoze.pdf
    • https://aawyx.com/sites/default/imageuser/file/51002687573.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6db627a7d---mobotopo.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/d64eefd6fd558f1fff4385b8099c0f4b/jigimukovosovebapar.pdf
    • http://naturallabs.de/userfiles/file/xovuraxepeleresuje.pdf
    • https://activepymes.com/pub/file/2358275506.pdf
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/zimufudelinojoni.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=wacky+wordies+puzzles+and+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f405.bin
896ea913757ac1cd42f861ede5a9fe90916666d76729bf93d3c499668bf1178a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF405 10852 bytes
font_01_sfnt_off00010d4f.bin
95149d3593c3883ddd1e1c05ab39116e38c66084a83060959e4a8fe35e8cb43d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4F 17316 bytes
font_02_sfnt_off00013a8a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A8A 16792 bytes