Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c7938ec4037512…

MALICIOUS

PDF

120.4 KB Created: 2021-06-26 07:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47e27f1d658872995632b1522e4b5368 SHA-1: a761a7579f17ecd89aeff6b960e632c3e4e77280 SHA-256: a0c7938ec403751230adeaaaacecb9f28553a32321f5eaec4f59844019a1e3f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9858

Heuristics 6

  • 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.
  • 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://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/951699e5b0beae25fa29526e9d8746f7/tavabubipo.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/1be58c4733aca21d1cb70285672370fa/rafugadewesajav.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/beae848a9699acee207c32e0777b6c54/43751539458.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1d29e3f8f---81572252287.pdf
    • http://daiichihr.com/uploads/news_file/roxuzoxajeludobu.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076a676ae872---59303083754.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160d207e044145---gogamatogewixinuko.pdf
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/xiwuzuwafunitiwunu.pdf
    • https://gaziemirkentkonseyi.com/upload/files/49586896847.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/e4e72b9d86170b0876b85467c36e24a5/nesilepetajepevuzoxuxi.pdf
    • http://carlaschroyen.com/content_docs/50320079023.pdf
    • https://xn--nmqu14inmf.com/upload/files/25831176174.pdf
    • http://nanoscopy.ru/uploads/files/72084725044.pdf
    • http://automotiveenergy.cz/userfiles/file/50489139416.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/4263e8d88d94683a63841f99564909b0/77922115216.pdf
    • http://mariopresto.pl/userfiles/file/83436026337.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/995f13072df184c92f46e91e7a072a87/roriwudo.pdf
    • http://fanti-fitness.pl/uploads/assets/file/dufafixozifudogu.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f5cd3aa4ce9bced5d24f2542fee62a4b/67610587660.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a84ce53fa3---tizelidigatuguvida.pdf
    • https://wisserarm.nl/app/webroot/files/userfiles/files/10319860105.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a81bd4c60b---58805772949.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/7838d43bd0fcc0b3a539723cf70cbe25/61037144245.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/ff9a99713b576357f8f3fdafe9b70a75/82730045460.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/10j0lse9mvmmkskli2b4of9n1j/zasubosakevimara.pdf
    • https://actor-conseil.com/files/file/13787890108.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=astra+theme+pro+download
    • 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_off0001737c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1737C 16792 bytes
font_01_sfnt_off00018b8e.bin
9aa4c751e2f0f588d0ec2076359649d8eac36d2c1f90bb823e5b6f452b41c3fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x18B8E 17884 bytes
font_02_sfnt_off0001bab7.bin
a72adffe0d166e796969ac428ef1daf7c6318ded59651a4e63c4d9e06cfc47cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BAB7 10632 bytes