Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7171d9aac1b8bd7…

MALICIOUS

PDF

87.7 KB Created: 2021-06-28 07:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5cf66d9419793490295b7989a4836f5a SHA-1: 9abf5087e407b11f81b16c3088cb106d037b1eff SHA-256: a7171d9aac1b8bd78be488853484290fc282228236e07da1e246222639acfb3c
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple URLs hosted on compromised CMS platforms, specifically WordPress sites using the 'super-forms' or 'formcraft' plugins. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on potentially compromised sites suggests an attempt to obscure the true malicious destination.

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://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/veto0oc6ikkme9c2pnvh9d5sv8/muvenegovutat.pdf In PDF document text
    • https://vmwarts.com/ecovic/file/27404538046.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160897716cde57---pekazetepopawulolekemi.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/xexeketalipalagopiseza.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021052618100573499.pdfIn PDF document text
    • http://chapelguild.com/images/usr/98009417657.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/revunaxujepororaw.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/2429af719a372d5392611173de9e1fc5/fuzaropanu.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d38b51cc4---megenojup.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a129cb052f0---91957786329.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/a16fd5e280ec7558a7a83b5f135899b7/8013538341.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/958056020a7a088be7dbd1974169d341/jorimowonanabato.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2778fc0541---gusitabovaxasupanevozix.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4148a6ff07---44195061880.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/fosolokilijobawine.pdfIn PDF document text
    • http://kesifveotesi.com/files/79501990109.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/de4c63e7a4e91ef0093f4154c0b61134/21132857618.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/57795129741.pdfIn PDF document text
    • https://aashianarealty.com/file/judaneramefuvebomudibup.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/gafitamaniviwumuwuwi.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/3jb3rsmig70oeormtscgknnha3/poxajoxa.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/e4392478e0f8c4bf15327e01f6ac8c7d/29572319461.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/48907560059.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=29+april+asteroid+2020PDF 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_off0000f177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF177 10592 bytes
SHA-256: 51eb9fc0f4b92093e9cdb261f4452b0ef0b0f291b662a8d023fc840d2e222a83
font_01_sfnt_off000109c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C5 17664 bytes
SHA-256: b29eb95a5d6bc9ddf7c23f0505d4f4757de142362c96e1ef320f3378510c0490
font_02_sfnt_off000137e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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