Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b53ca0f2a818f36…

MALICIOUS

PDF

178.8 KB Created: 2021-06-30 02:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7234c2a17033ab237a806214a66e1826 SHA-1: a8503ef4746f01d7a370e836325988f31267f357 SHA-256: 5b53ca0f2a818f3631629e52607cafa7d141fa86b8d700c4c572fa6f4128ea22
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to multiple compromised CMS upload locations, and exhibits characteristics of callback phishing lures. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to trick users into downloading further malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9716

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://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088477467e91---zevizagejenufaf.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf7bdd55b9---zudefaduvozogezapuxa.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b764d126f9---wadexerapupibizafin.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/23925427eb390ae4ea0ea304010f71d0/sonegemolaxuviko.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d3d35f624---43123964581.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/21287030576.pdf
    • http://studioturina.com/userfiles/files/66645287261.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160735802eed56---jijapuseleveretujimetidax.pdf
    • https://bruceautoservice.com/files/file/98875035313.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e8ab7dd60---kowozopuzevunatefefe.pdf
    • http://kursadowicz.pl/Upload/file/31040833306.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/e611a44885bcde6e5668335a6d48b97c/noxisasovuvalafezizerebil.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ce48931dd---62495739345.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c690c8904ee---23332468850.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d46f87ae1---lozomon.pdf
    • https://red-adlay.com/upload/files/tenafezudux.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608f48a277b52---73807822279.pdf
    • http://transinfosoft.com/userfiles/file/duzojomejelugiritazar.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10729bdaf2---wobuvawarazuginovepokom.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/30383486ce4b7380ced3ac5841bfd33f/40379586878.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/l4htdkh0d19j32q6ov5p6rs1j7/51963860119.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607599eb70ca4---kilizinebiliruzapo.pdf
    • http://adams-gold.ru/archive/image/file/xadop.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=indian+heritage+and+culture+book+pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00024895.bin
9cb9409e735ffde7d70956ee38494699400a038d359b6d4c6607868adc0804d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x24895 11016 bytes
font_01_sfnt_off000261a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x261A0 16792 bytes
font_02_sfnt_off000279b1.bin
00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x279B1 16140 bytes
font_03_sfnt_off00028f29.bin
8c855748761c68d214b8f41a10104b813749c3ff1a46b8a741864b36057a51f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x28F29 17316 bytes

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