Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac131be97f4bb59c…

MALICIOUS

PDF

73.7 KB Created: 2021-06-25 13:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c01d47fa4f7bcb71e10100ccd440a3ec SHA-1: e974cc836a32151b7ab6536200c59e3cb05dcf1c SHA-256: ac131be97f4bb59c2bcd40b2dd20ec45c72203348863df7406a8937c765e10a4
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories. Heuristics indicate this is a link farm on disposable hosting, likely intended to redirect users to malicious sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, suggesting the document is part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9b43e6975---gedokapiforezabore.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6edbb44cc---movapitepesomekabexowuwof.pdf
    • https://eventaipei.com/upload/files/31213720795.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/408f737717f52399c53ad180c03f0a84/15403389211.pdf
    • http://dok-vo.ru/userfiles/file/felezikawuwarakegusogu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e38ed6d36---60670734271.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/67bc2b8d893d09892659f68c6f0beb33/30542648883.pdf
    • http://brandnewgoods.net/userfiles/file/mojisevipakumexa.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/snjq0b0n6cng1bgd162c82mdmb/jofis.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160928aefa6ed0---22946642007.pdf
    • http://dh-cell.com/ckfinder/userfiles/files/243235195.pdf
    • http://www.chatanakonci.cz/userfiles/file/77209982890.pdf
    • http://kayamedbursa.com/userfiles/file/68042695356.pdf
    • http://donauwell.at/userfiles/file/46186382332.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/ucctmjear9o58r3d2lhn0t415v/jeginukojorixu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=create+pdf+from+pictures
    • 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_off0000bcc3.bin
f239d27b777bdc06bc3434f198ecb90a9392bb859281b80fa69b3feb76d969cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC3 16516 bytes
font_01_sfnt_off0000e7d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D1 16792 bytes
font_02_sfnt_off0000ffe8.bin
764b1211ea6214ee6d0e613e54c920626c6bd8bc6c938bbdd6f905876dac0f4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE8 10764 bytes

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