Malicious PDF — malware analysis report

Static analysis result for SHA-256 07aa161c926a3a8d…

MALICIOUS

PDF

91.5 KB Created: 2021-07-04 19:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82d1b7d61bf443ae668e24844287e6fc SHA-1: 40bceafb5692f5db1cde0c6468a2556fa6b7aef5 SHA-256: 07aa161c926a3a8df1cd33c46521b125068baf1de40517b002df47dd824b87ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM further supports this. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://wastran.ru/uplcv?utm_term=hammock+bait+and+tackle
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607689f8ab745---57333937633.pdf
    • http://k-yoga.org/file_upload/spaw_upload/file/20210510134039.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f835daac4---dipakopeberasaga.pdf
    • http://blueyee.com/upload/file/150555257789.pdf
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/najelobafu.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e108b550f---zodiwepi.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/f4053ec352c0eec85f9883da3d7d8d96/49204088354.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084f57711e9e---97407736491.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1ce79b2d4---4842638793.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820132ace7e---nobipaserapeloxal.pdf
    • https://takipcisec.com/calisma2/files/uploads/xagubaxasugufib.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707967dacd5---5374812975.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4a44b4e15---45906056932.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091c4cb0d8aa---63810206309.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/e695e4997fe3e7e79335dcefa186d3a6/fewemonipuxij.pdf
    • https://majubesar.org/contents//files/37178552454.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/3fca21ad8f4ab8b72b33ad111a818ffc/jojajadi.pdf
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072604b9cce9---89923748672.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/573c0a43af08458715c51b8305ed1fa0/33282717081.pdf
    • http://guides2alpes.fr/uploads/file/noredip.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_off00010271.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10271 16792 bytes
font_01_sfnt_off00011a88.bin
6dab6bee50e45c558671d7cdd1d38678183cc0e36b548d59438d641e53771c4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A88 10484 bytes
font_02_sfnt_off0001324b.bin
97a98ffc1a5c3a54fefc593978371f140b638f518d514928e7a48deff7eb65cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1324B 17312 bytes