Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77addf736ff8bfe…

MALICIOUS

PDF

84.3 KB Created: 2021-07-07 07:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 06e8c092074039df3dc4385bcf229499 SHA-1: 37c8e8bb288d39d058e9610c704101684c8e1fe9 SHA-256: a77addf736ff8bfee360abc833c3c1512571c6d0fb13fa537d18920f8753c4d5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites and other potentially malicious URLs. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/iqsoi40llgkg1156mjfsnrqtb2/rujarisigabut.pdf In PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/6hb7r2pvfodm35rjq6qg8oniqv/7420011745.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/zogiruwafap.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6e2e041a0---mizaberirifafiza.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f37d0b20a2---faxalewumusaguladupuged.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cadc81024f---jerogopabex.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160725c8d422ec---zozegosuget.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840b9d6ae4c---39153391083.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23c201cef2---73864897258.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/ecb25a27d32802b0c75b1b82d7f1ed45/96794852293.pdfIn PDF document text
    • http://adveotec.com/img/file/titefofepadekajelalo.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/vewovubu.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/1008a1b00d0de63c2992563a2e7f9920/mesebediv.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/23497948514.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a1e7664f23e225b1119a24b2eafab75b/dusol.pdfIn PDF document text
    • http://greenberetrotcmedals.org/clients/e/ee/eef2f5edcbf7b69ea683240098563b39/File/zibew.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/fjml3go71rud8jri3seluedj45/42442986920.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/muxokekuwijiw.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/f526330d4fbdfbc19a5f7169684847f6/78728890008.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7506c9db8---65882594369.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/i4vmaml6s87jvk2s0vatefe0r3/7428063671.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/744238f524846807a71ab721b94beee4/85795398442.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/43387860296.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/497cdf406f6e862dd702857e20c6444c/kazofosaberazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=lost+your+driving+licencePDF 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_off0000e631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE631 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE48 10620 bytes
SHA-256: f546c760702e087b856cd934764d30d46c05a813d292fe6c579207a62d85d71f
font_02_sfnt_off00011683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11683 17332 bytes
SHA-256: 1e311c1a31c72d683ad3e31afae0147ca6ff04fb4f6e63b9a4e15d9b7fccce87

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