Malicious PDF — malware analysis report

Static analysis result for SHA-256 235ecab8a7e3e833…

MALICIOUS

PDF

171.2 KB Created: 2021-07-01 20:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2c4193dc8911265fcdccaa68ac9e4956 SHA-1: df13c32a46e38393b4140eaa2d03a5efbda7b430 SHA-256: 235ecab8a7e3e83346f80cb8eaf3fd579f7053542c2479291b04297a51762c1a
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of numerous URLs, many hosted on compromised WordPress sites, indicates a likely distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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) or Microsoft license-boilerplate 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://henri-ruch.ch/doc_pub/file/tiwilakegerodavunemomu.pdf In PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/l987a37vs4f8q9ed73p0ptpjfa/dosafaresexotavatenagaj.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/vabajapujegu.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/a330bebeae7c294d7b6f2c1ad5142e0f/10826095578.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a3d5cba54---2631643221.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/5205759924.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/c9c4fc7f9a2c45f44d58b061aee037ac/gedugekote.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/35732351d7f453aadb1a782f882e9029/85777883815.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/tpvcvejoddr1ubcfr2hku04rfb/naduf.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a498c460f4---34037397584.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/51033978464.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a98513a55---mezolarifa.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/12b9261725c994dbe20f958362dcb992/bizulibijetimawokisazewiw.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/29185415469.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/1b1706f3197a43e341321e643f3f5368/40791025350.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/18499174f2e51c88429e88bd80b66733/surik.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d0ea25c2e---zipedibabikuzezes.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/0fb1d33d6d2e2f4f24a1c45db50f131c/gotilegowusuwonuzuk.pdfIn PDF document text
    • http://castanienfamily.com/clients/74558/File/welaxovalipuberagolawa.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609451261b20a---45648632416.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a8e3c97f9---kirivesokabejokawegegufuz.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/75242222017.pdfIn PDF document text
    • https://cutandcolorparrucchieri.it/file/43699587041.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=oxidation+of+clPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002315f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2315F 24436 bytes
SHA-256: f8ec1ecc4af19196afe5845174c3bfc461ce57ef00f76616ea861e8db21d4260
font_01_sfnt_off000270b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x270B0 10196 bytes
SHA-256: 46a83de1a7c89ee75410ad41503c9594986dfdee42001591c3ab094a5cf26533
font_02_sfnt_off000287ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x287AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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