Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a64952e2293ccfd…

MALICIOUS

PDF

71.2 KB Created: 2021-09-24 22:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5a36f8837b9e9b46b89f1160f569a8fa SHA-1: ec3d70bac214c96dbea28c91016519dba2e46df2 SHA-256: 6a64952e2293ccfd16572fc0830076528845e7dc219fd334d6e94a667a875557
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of external URI indicators and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=ms+office+free+product+key+2019 PDF link annotation
    • http://fornacedelia.it/userfiles/files/49734734784.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/86764988790.pdfIn PDF document text
    • http://ecogestval.es/userfiles/file/roselipiwapon.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210916213505.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/furabuxonebalutopitim.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ri7uaclmjq4pgm2o92d6j84b0i/bepokopatuwerelul.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/8b8gnhn8ps7cu2kfs7957kg5on/xoripozidogoma.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/161395f95ec0ba---rixodewawowimobagi.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/72635083146.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/ninoxabejisutinijesanuwo.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/pelebazezapude.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/1026777607.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/dizofogomakotaza.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614174e0816c5---12240481241.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614d8884cbd29---valelaziko.pdfIn PDF document text
    • https://eventaipei.com/upload/files/93128943892.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/tezeroropuz.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/10774740641.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/fezavetewazawuv.pdfIn PDF document text
    • http://keacg.com/upload/files/23013127531.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/bilotojipogizowixavuwev.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/18654125558.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/vorupuxugodafirekexiget.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/labolurebudinufemo.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_off0000b402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB402 16280 bytes
SHA-256: 7d76b5566bfc0b9806a5e1f73904ba59de5e5ae743d2cc72c5de28553a1b4e7a
font_01_sfnt_off0000dd63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD63 11064 bytes
SHA-256: e0ba44c6c7b67f36963c6d69cc9aeb953b9cc64cfabefe359974ebd0a059b670
font_02_sfnt_off0000f77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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