Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbba9a87988a33a5…

MALICIOUS

PDF

86.6 KB Created: 2021-07-16 09:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6716674328d84a49102f3333d923c24d SHA-1: 2d231767e5b12e65b485d0a07608dff6875fb203 SHA-256: fbba9a87988a33a5ddc548e3bf788fb8f445d44d6bdbb38499ece98da519d22c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm, pointing to numerous compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

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://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/1pdbv7a2u73rbv4h57quplqov1/11538850647.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5e8d54b74---33167248787.pdf
    • http://azizolace.cz/images/file/30758747981.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabe50e3e68---21320071323.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/habbvbjnjun2hs5ogmp3li18hp/razitigurur.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3627e2d332---resekujisinalukobifepu.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfe0435b144---10458320393.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bba557866---83433787616.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/ef4f0c491d52239390ba5474e6815683/42617083860.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3905cbeb0c---tifimemo.pdf
    • http://paradisetnl.com/FileData/ckfinder/files/20210629_842FAAD493AC4717.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/983fab75d17cd5241b44ded90bc1508c/kokonulumotuxiro.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/26aab1b6fb64fd7f2d6c5bd361ca9790/bevodilidizinur.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077924f23a22---4961377252.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2087948e62---78316237200.pdf
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/56339620769.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/829ad1c23112131dbb5ff00152086ef6/80674410507.pdf
    • http://asckhn.com/acskhn/userfiles/file/wegara.pdf
    • https://nbtele.com/en/cache/fck_files/file/witafejiteminonuronitanek.pdf
    • https://pbchistoryonline.org/uploads/file/gimeligilat.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c33f6e8b08c---24315521388.pdf
    • http://vantaibactrungnam.vn/upload/files/zugelitod.pdf
    • http://donghobaoan.com/uploads/files/65609166150.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=compare+excel+to+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_off0000f116.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF116 16792 bytes
font_01_sfnt_off00010928.bin
12ff55a16d8a70f83f7557eae07a61c84fc6584e354482c39ee6669184257252
pdf-font-stream PDF embedded font (sfnt) at offset 0x10928 16988 bytes
font_02_sfnt_off00013586.bin
363ea3a60cd03577ecb06562df197f85d81ca651a9acd9db5c6157225aa77a10
pdf-font-stream PDF embedded font (sfnt) at offset 0x13586 10548 bytes