Malicious PDF — malware analysis report

Static analysis result for SHA-256 428a910a94713812…

MALICIOUS

PDF

85.9 KB Created: 2021-06-30 11:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a2336b22d0eccda3c3884e3f77cfca14 SHA-1: 88627e4f48b894fc9efacd6bacf7667f4cca62b1 SHA-256: 428a910a9471381225d61b74ed1ce7f0431bab584085ccce71e50ba6f4265143
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting sites. The presence of external URIs and the overall structure suggest an attempt to lure users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://bawaniint.com/ckfinder/userfiles/files/rufejuv.pdf In PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/fc6058d5d6ad00e6d55f17795397bea0/pukimajimujipigogore.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8873602c56cf27c3136b28a78745ee1e/fojonunakoz.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ac32c8e93b5---bavizanaxanodefobamari.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/vamixamikitusarewiv.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/kf83a3b76tlhlqf4i1i9p819fp/87286666726.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/26558649549.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/tumapozetiwelazipituz.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ms2nl9ks57cria4kirgqspe852/pomotixamexapevo.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7808e948d0---42559231662.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607086aa4b002---vazalu.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f09ce23173---74980449890.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/xogumixakuwebenetoxogif.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/imqdmvj6q4skshuiu402o2cq1k/82759365946.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/39760195259.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/vel6dioarn3ces972llihtmcv9/7113870891.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160778977770bd---82699903844.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/dapusi.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608a464975e29---49938235391.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/badupulerodox.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/tirubedove.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607337bd2c3fd---tapetukudajususafujer.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/fulixuxepapipig.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/65621314642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=delsey+luggage+lock+resetPDF 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_off0000ed67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED67 17128 bytes
SHA-256: 0a297851b95928d415c415bc5e52d8ed64d6a37b8f0f45e1ffc45f5977572bdb
font_01_sfnt_off00011a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1D 10516 bytes
SHA-256: 974e0dae8c34e62dd2b24d24b57cbbc8f3086581f00c15e5c46411af953b0faf
font_02_sfnt_off00013258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13258 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1