Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c8f19118aa08b3…

MALICIOUS

PDF

85.0 KB Created: 2021-07-18 09:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 88dc493a9b953a02fa872aa3219121d5 SHA-1: 765282239754daa3fb8763a8ec14d958b8073fc3 SHA-256: 67c8f19118aa08b30a5308c934eb3112488f5af28ece280626e1afb7c1687101
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, acting as a link farm. These links likely serve to obscure the ultimate destination and potentially deliver a secondary payload. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/ea935b0905713e0fbc7014715540638c/novumozavemumakiwezuki.pdf In PDF document text
    • http://asja-doll.ru/userfiles/file/94212392360.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964189cb7f1---zarunomorizesomivejo.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/1953d8d36203fe892e8ebef7a3ff8804/jumufizepadimo.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d38e6c445---sifeke.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/8947d22b75298edc7dcc0ed6351faa83/7959213422.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790a9a86920---tavatadabixipejudiropazok.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/tivutufafaxegoko.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738caa9af8e---42541718030.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdf4f2c476---dasanumetitegaxalapude.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/19443154917.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabccc25e57---69309445008.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e823cb397---jolaseti.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/kobilugapepozolefejaja.pdfIn PDF document text
    • https://allianztc.ro/files/file/fuludetadonevofijenevi.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/20914843340.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/a0ad61cae29696ac66dc06895df20b30/83594225956.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/cc6659faf9eea11bbb3a35525b805a78/kesugerisusetaranelef.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/nilebesekozop.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794877242b6---tuvoku.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/a7cbbbadf855a2418ecbbd39ee78cd39/voxesuwamekimam.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077b46cf001f---72644433345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=emerald+cockroach+waspPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A1 17296 bytes
SHA-256: 1b7cb3e916a8ac8f1694d15c1f20482eaa5ec40daea3eb0dd91280e55d58e64c
font_01_sfnt_off0001167c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E93 10648 bytes
SHA-256: aef90d27d3854f1b678d022171696a61a76e7756a7c12cb986a9e3294d6aab53

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