Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7db3986a3bbd0b5…

MALICIOUS

PDF

86.8 KB Created: 2021-06-28 07:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e12ae2358d44091f020b27cfec6121e4 SHA-1: 82fa6962479163d2a0c8144a78dfd8a6116f83c4 SHA-256: f7db3986a3bbd0b550b76a6f1b42f3abe473b61cf3c5c7547cbab6ce881b9fd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ketchas.ru/uplcv?utm_term=magic+duels+android
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aeeb1777354---dufarilelalevimizikebu.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16085a8e9dde57---70105097776.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/de814334a04bde153c3eec05b841c1f1/20728343729.pdf
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/24342559810.pdf
    • http://amandamaitland.com/images/file/1878190525.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608a288997bba---46248359046.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/d4d61cf9bdc10947af714cd704f7b5ef/67158158355.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608486094cd78---jutefagu.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/scevc98kihfp5k49g9spg6d4so/27681952771.pdf
    • https://hissekurban.com/resimler/files/pepibunoremomodudus.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087cc5c9e529---2801653404.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609165efb2744---rejozalifizawa.pdf
    • https://sinhadventure.com/uploads/file/33909333207.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608145825e21c---wukujesuzavunulede.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/r5juhqk1gbi6qoiqnqi85er32a/bepodakobejibozovusij.pdf
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/25786406404.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/prnsspgnniasbc8pk6stfm58n6/siwejaxesufededaget.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/4m1t1g6mr1j0elqhhu42de23p9/mupelegufifadokota.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/25e233b8f387960ae139a49a846b3ed2/10039271839.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c9f7a18d1---vesugusa.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/c38a0f7b6cb6d98f32230c39d653a3ca/28085836022.pdf
    • http://aggengr.com/uploads/CMS/file/zosuxomarezalukakunopade.pdf
    • http://capital96.com/userfiles/file/31312396067.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_off0000ed88.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED88 16792 bytes
font_01_sfnt_off0001059a.bin
8e11e44e0abe458f1bc8b6218f8bff735f40070e628746fb9691808dc116a03b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1059A 19220 bytes
font_02_sfnt_off0001367f.bin
dd9bf7473907910dffbc69d6f57e073d5608b957667b6fab42224dbf2873916e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1367F 10540 bytes