Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2fae1cbf4a91a5f…

MALICIOUS

PDF

80.3 KB Created: 2021-07-24 20:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 2646bec270f2ecb7b80d86b37d62ab45 SHA-1: 624e6fe5c0d71b63d0eed69b0d3b2ab3c3d1229d SHA-256: c2fae1cbf4a91a5f4bd887b3c2ece88184a15e118357bffb2169a0afae4764e0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, a common tactic for distributing malicious content or phishing lures. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://micsys.in/userfiles/file/62201721538.pdf In PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/c14de77525987bf93f795e1214e26cd5/filiwa.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/77041827283.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6520ebf44---30263955696.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/72575d21f63dded94d881f619b76c5c4/31738205390.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/samodotenekoponezawogutud.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160affef1911f4---wezoxowojumis.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/38962122732.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/88375248425.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc3e94a29b---90650949225.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/jemagelibonudununonav.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c857b3e47e3---14772472633.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/watomepizip.pdfIn PDF document text
    • http://cocoal.com/uploads/file/70608202757.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87efbe24a7---sisam.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebebbc65cc---81019280192.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/6386840226.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/8b939e74f7a8b0d98e8193c0fd38b1fe/50660482143.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/larujesodibanunedenenedej.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cd95acd1bb8---zapajanukevalote.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/zapateg.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/909133f8de36b91ce266c7e23b42204e/kekogapokavogasidu.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ddc4b4029---kuxujuwitinagil.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/ulf4vmqrvue6m73d3d8guesrv3/nipad.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/81983388130.pdfIn PDF document text
    • http://d4svancouver.com/clients/c/c8/c8601140a4283eb9b700f388a83987a3/File/11884116660.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=assembly+drawing+solidworks+tutorial+pdfPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47B 16704 bytes
SHA-256: 9aca714866abaac847b6a63d64ac5f6e41093129ce723d63d370d7bf0242b80a
font_01_sfnt_off0000ffd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117ED 11356 bytes
SHA-256: 23746d09b654ecb96295cf1d9aed5afeaa1a74eb9fa3f88bd609ab3479a38f29