Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7ac5e6652bf3647…

MALICIOUS

PDF

83.1 KB Created: 2021-09-04 01:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 685b1c503486ad6eb7aaad484930f4c2 SHA-1: bec6a47c74d6e7c4965eb98940cea1ef4147d031 SHA-256: f7ac5e6652bf36473d9f2e86d00ae7ac4856e18703106bde857fee838640595f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links, many of which point to compromised CMS upload directories and disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16076d7fef0ce9---wologesenosabupaxer.pdf In PDF document text
    • http://lactopad.com/uploads/files/80551025126.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5f4607245---54557415653.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e461e85ca47---nigexukalodev.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160da655f1dc34---jelenorof.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7be23ccabf---rizedavaneridarugozuvob.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/tifefofuvok.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/cf24c4976a7a6cf645b16a7218186336/52079602615.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/d0d9927b40eea592eead309821d4bb4c/1628108116.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16102ebcca3c1a---motul.pdfIn PDF document text
    • http://www.christianhouseshare.com.au/ckfinder/userfiles/files/20035545416.pdfIn PDF document text
    • http://aromata.ru/upload/files/94959260290.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/73b3ab80697fc746ee99c5c9b8aec2a3/59141206652.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/df647b84275a50623f3b59d9e007417c/zonomidadufivazat.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021631023368387.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/hb7st0k2vjlmqr2nrb1hu0egj7/puvudumuwemupa.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images//files/69320654389.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/84740306235.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/64491001411.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-8-9/20210809192737878475.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f2b2e8c97---tekufisegakozojulutaxu.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/83089861797.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/nitubafijurulodonese.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/43410717788.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/pecdtnp1sgldv53h3fmgbadne3/sajoruk.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/40930389827.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=genetic+algorithm+introduction+pdfPDF 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_off0000dfc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC5 11036 bytes
SHA-256: c4703d4e27f08634c7fedba2dae59dc864c2c62850b2a920e9cf24a3263da7c5
font_01_sfnt_off0000f90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90F 17436 bytes
SHA-256: e2721a792142ed920ed66a7503387f990dd866508fdb664b12bc999b2ca471c6
font_02_sfnt_off00012668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12668 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1