Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b910065e73963f…

MALICIOUS

PDF

72.3 KB Created: 2021-09-01 15:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c6062a1f720d46cb588e45a6b4eaabd1 SHA-1: 33f2a5e4ea601b137eede05140fb817ac40bfdc4 SHA-256: 42b910065e73963f81bfcee1be85aea87b53574af9cb79ab58d1ca0d8a031ea8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites, likely intended to lure users into clicking malicious links. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/bcbc3486eaa13de5c2e4f65095f4ac93/22180656551.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2a4775a39---xudewajuvedojunixa.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b3a05f79f---muveripipuweziriton.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a9723e19511---jitun.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104a1389b081---86060065750.pdf
    • http://wakarusavalley.org/userfiles/file/rijaf.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/l6lgp6imko2ad7nj9qq8ohat5s/23066719409.pdf
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/22471983234.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4266d670f---zemul.pdf
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/6f4052d04285b36475b609b53620343a/77216440185.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/39n45376s2opme8jcnu282d4r4/kelefumigutebenodabudix.pdf
    • https://aplusadvance.com/naver_editor/data/file/21345855747.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093dd6fa30f2---68531047613.pdf
    • http://pensjonatagat.pl/userfiles/file/66591802779.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c4de43f0b---sewos.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c87665006c8---88688391199.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf6908d8c38---pixogebosabavebop.pdf
    • http://tutaylamhet.com/storage/ckfinder/files/tadetiwiriru.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081141debe47---nodusefefekegaz.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/v24nom4eekf6j6q0519qq7r7ls/mozode.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ee1a07429---wawoze.pdf
    • http://aucoindeshalles.com/menu/file/73056323080.pdf
    • http://divorce-difficile.fr/userfiles/file/pakiduwefus.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=tiny+scanner+for+iphone
    • 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_off0000b84b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB84B 16792 bytes
font_01_sfnt_off0000d05d.bin
a65e81bee6428e34e76dd9d5c048efc0a6a7da5f5a9113f7152852544e024c11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD05D 16972 bytes
font_02_sfnt_off0000fc76.bin
4684fefd28addfce67ac3cf33d88c017c9ce91e8af1c4c6469933c64c823c250		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC76 10508 bytes

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