Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff71e2f0d0a8e56…

MALICIOUS

PDF

88.1 KB Created: 2021-07-14 07:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 1b3f1400dd06b4091c59d1888eefb174 SHA-1: 7b22635b61588f0d4b08da293b8c11048077e257 SHA-256: 7ff71e2f0d0a8e56399ecb2ee7f5a5962068a5cc91186efa45f7837cb70bf90d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of embedded URLs and the nature of the heuristics suggest this PDF is designed to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://ketchas.ru/uplcv?utm_term=cute+things+to+say+to+ur+bf PDF link annotation
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/693a1acb26134d7a779f1581497834f5/85230991105.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/94974808591.pdfIn PDF document text
    • http://ridendo.cz/files/file/88885611875.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/e62c468a3bf69c264af18abae488120d/25131674132.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c5f786c12---bajeridabezepedi.pdfIn PDF document text
    • https://silga.ca/userfiles/file/mapopawamezag.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/5q243lnkkbe2mcg1g9a1fev71h/fobelomefovozile.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/c8mr8e3qq52d4e0kcrc2pqm1g6/biraduzalukeb.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/kesizarutifami.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3240d79576---rotip.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/jesezu.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5675a53e1e---pagikenetifej.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f10f60a6dd---81444895540.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/bf83a70e0c57f98d793dc44c2a1e290c/zefez.pdfIn PDF document text
    • http://rayanchem.com/d/files/kajexenitidixurogefifibo.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/39274312520.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/71577122918.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/814b21e9bddbb51f334112539e710d0d/duzomekezoladunidid.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160af2beba79ed---8797357367.pdfIn PDF document text
    • http://alexsrmenchion.com/clients/b/bf/bf5401b25fe3457642f5a6f1150d5537/File/mijolekesewesafararulep.pdfIn PDF document text
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/4f7fec954f032195abca0edc8c6c6848/xelinikujejunikipopotesi.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/qoktpu96jn5f0u0dssm5q23j67/50945482574.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/ms56hqm7qvmu9p8sr7euoo2sm3/74686946788.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/7o78h6spbsh1lg5cfv627hhpgd/13953540785.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/d518889a9e9d38b73f0cb803de21e6dc/doxorinenegawaguj.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/d55d72500ddc34c5c2fafc30ed092a07/93357717333.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_off0000f578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF578 10832 bytes
SHA-256: 56978f782640692d359087c2ecd92ade36d4c73a07357a35ca23e5949addcac3
font_01_sfnt_off00010e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E83 17132 bytes
SHA-256: 50cbe82526ee88a58896bcc73e0bce02457047cb07b1d2aa0d90bd95e331a138
font_02_sfnt_off00013aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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