Malicious PDF — malware analysis report

Static analysis result for SHA-256 f542f12977d56e46…

MALICIOUS

PDF

183.9 KB Created: 2021-07-08 09:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 28a50c934a8560b9080e22f8ce38a993 SHA-1: 06fc604344a0ba064d0a9feb455d1030cf5669c2 SHA-256: f542f12977d56e4634ee49aa25609c4bc36853b020cd224742d3e0b38a8813f4
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to host or redirect to malicious content. The presence of multiple links to potentially compromised CMS upload directories indicates a pattern of distributing malicious files or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4f43eef3a---sejasulagibedopi.pdf In PDF document text
    • http://grandinhr.eu/images/user/file/pewogakekoze.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/68165822983.pdfIn PDF document text
    • https://mfdesign.hu/files/file/vadupobemoj.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fc1da81bd---27601071853.pdfIn PDF document text
    • http://renovator.cz/files/file/suxug.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ed7a3f37f---43750002384.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bab4c77fd---60295911081.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/e5b49ece9dde61ba1cdd71225d5b54aa/70464446999.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bcd1a908b---dajizaben.pdfIn PDF document text
    • http://camwater.org/media/files/75757321649.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/4d1a07bcdb4e7fea985d4b7d2d05ad61/rixanuxugevuvodugu.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/xadede.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/57343592035.pdfIn PDF document text
    • http://makingthegradetexas.com/clients/d/d4/d4716c73f098ea79da165a2194b6736a/File/zuxavegal.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/40276658503.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/vvtrcoi44c8e15hubabsp8568t/97996853785.pdfIn PDF document text
    • http://splogservice.ru/content/file/dupifilogelopasuzu.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/vezanitanegu.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/titiwis.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/nvlvc75rs7mdi8b1n7gkuhcjep/gidosadigugekoti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+use+emergency+contraceptive+pillsPDF 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_off0002701d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2701D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002882f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2882F 18492 bytes
SHA-256: 4a3d1ee1ecf25205a915419ad280a610bf5036a3c353055f950bbb20b1488a95
font_02_sfnt_off0002b7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B7F2 11076 bytes
SHA-256: 550b498b6ffff3a7eb36a79cbd564b1e89c10f979fa9b95b344162ca651cadda

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