Malicious PDF — malware analysis report

Static analysis result for SHA-256 3287d8aa319b1e34…

MALICIOUS

PDF

74.8 KB Created: 2021-09-08 08:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 48e0fd6d70235c78c6f09f79503b460b SHA-1: 38452f2983c5b4d6f2236c3f4682d8a14cdff0d1 SHA-256: 3287d8aa319b1e349595ac9bea8fe30618d2e4383c0c13265f3a1d3978a039ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm used to distribute malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the true hosting of malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2b8e8c220---98985665162.pdf
    • http://applexin.com/ttpsea/files/file/sanebawexinapebi.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/tme3c367lgi228f6372pav9uhk/54252593166.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8801ff1ffc---makezuzurori.pdf
    • http://eperon-kochersberg.com/img_db/sajivikizenisugepazaxu.pdf
    • http://thessalonikiflights.com/files/files/55631486424.pdf
    • https://faltprasten12.se/anvandarbilder/70/files/pepagidizakalevel.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/3b1b90cb57275a6aa92485fd9912c815/26710332030.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b45611df9d0---85623102869.pdf
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/pogasosomoxi.pdf
    • http://changwontour.kr/FileData/ckfinder/files/20210628_AB9F66603C7E4100.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/9e9edffa82802cdb490826417a401522/70773229702.pdf
    • http://romanakladatelstvi.cz/userfiles/file/24425528457.pdf
    • http://hsiwww.com/image/files/20210622_212510.pdf
    • https://menlopark.com/wysiwygfiles/file/84889021011.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f16454f15---63813513239.pdf
    • https://mimpishio1bet.com/contents//files/58174510046.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160785afb30269---divomuzodi.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/g4agn1hqssv919a8kbdanuc330/nadajufalevoniro.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c53a96229f6---fitukomiziluvidisupaluxum.pdf
    • https://its-bulgaria.bg/files/file/22901261613.pdf
    • http://schokofontaene.de/idata/76916122629.pdf
    • http://pozitron-s.ru/userfiles/file/23016016618.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/7c39480617161864dba56d817c4bead1/pujetovofolilejon.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=vanguardia+literatura+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_off0000c16e.bin
26baa861169f0e90bb70996dead5e45fcb3b42eba24bfd972eb33b35c20b18c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xC16E 17188 bytes
font_01_sfnt_off0000ed94.bin
743c380a0e6c3b04d25972cae8f6104f2c2e3e14dd737f9b4580c52fa45c3416
pdf-font-stream PDF embedded font (sfnt) at offset 0xED94 10452 bytes
font_02_sfnt_off00010532.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10532 16792 bytes