Malicious PDF — malware analysis report

Static analysis result for SHA-256 b32cab8fa70944df…

MALICIOUS

PDF

91.7 KB Created: 2021-08-01 17:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 14bea277025cf6bff522f52e8e8cdcc0 SHA-1: 203fb3103966a4fef360118d89a615b4af2fe87f SHA-256: b32cab8fa70944dfd77c808ef2341b019115403ecdf4ca0661b466349c7a3b80
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution lure. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the PDF acts as a link farm to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nomylo.ru/uplcv?utm_term=magic+chef+dishwasher+du4500b+manual PDF link annotation
    • https://mmszke.hu/files/file/fubejizegolol.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e584f87196---79909352961.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/a79b810fdd04e0ba8b56916fc7ec4ce4/wofumigolotarev.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d6b089161---98249976906.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d47e0b1698b---9446675755.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/98963255274.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16088862695703---jigimaw.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d05ad2d56---3311513569.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/faxubuvesanawapi.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/zigasiwitijevavegojoku.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/0c160dc291d2ec1dc7ad63a456902c2f/15279310816.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/15627313614.pdfIn PDF document text
    • https://medius.sk/userfiles/file/lefusasiv.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f8a9e8208cc9aebc066f475ac41111b2/nururakifomimiwositop.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/pelomutopebedadorej.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/ak62uhbt1ngtah8ns25nscb786/gewifeziweno.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d3c8441459f4f6cf61043d49fc9f74e8/vilofiwe.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/raxaga.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/53432174705.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/s1pf9tedp8omksg3jbfujqcakk/nuzizorevijefazurojigot.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801ac51b957---gozatefozodazod.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9582cfb72---50008159093.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/fufidofowesigakako.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/95101222065.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/d892e7d845cc5fa61c44d1db5b0e686b/domarinofosogikataxos.pdfIn PDF document text
    • 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_off0000ff24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF24 17840 bytes
SHA-256: e2b7cf039221e143f06e9bbf9acef49698110766d383f1b0be871e85230500b5
font_01_sfnt_off00012d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D52 11360 bytes
SHA-256: cee88727cf785f09340623bc71ac07c851c0d8b71ffadeabc999c7993b93338c
font_02_sfnt_off000147d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1