Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be088d2b4666070…

MALICIOUS

PDF

77.9 KB Created: 2021-06-25 15:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c30449bf5745ed09d8ecdd5f4f2fd2f8 SHA-1: 281896e0d64b07d6a6fcc291469bd01b5e3386fe SHA-256: 8be088d2b4666070dcf75b830e1bf28affe3b2463967263a635c260d019a92cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with multiple embedded URLs pointing to potentially compromised WordPress sites and other domains. The presence of these links suggests an attempt to direct users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=dr+sable+ophthalmologist
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d6584be231b45a371f57114ca9b4d464/28386797428.pdf
    • https://al-farh-iq.com/upload/userfiles/file/jilapodebatiki.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9d7939bc1---vizubetibitadujasuzezika.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607525a2db3d5---52101958113.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8c16e4addda5564f822f0fcfd8fdffca/64935376335.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5da35cf1fb---20340050793.pdf
    • http://alt-1c.ru/userfiles/file/wexabaliwenefogolil.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ab696d95589---44181331123.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/1dc27c4b5500bf95a5692b93c4f647ce/tupeluxa.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077814997d6c---29882548435.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/6b822c68f3a43e2fa1f8fc8cdb81c0eb/12444350970.pdf
    • https://mfdesign.hu/files/file/gagudutabobep.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bf729958efb9d93ac422b19978513989/24168791733.pdf
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/2275798cd56810d06b779603ce27c052/86579876811.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccf6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF6 16792 bytes
font_01_sfnt_off0000e50d.bin
361d8082fd7e99d83f0d2a9cef3f93c70b0221d6640d53d75c2fcf101d8ffacf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE50D 10736 bytes
font_02_sfnt_off0000fd7f.bin
4f30326826b0ad4cc9794b60af26b616b108e3b0fa5ac541b6bf9744ee1e7b91		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7F 17576 bytes

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