Malicious PDF — malware analysis report

Static analysis result for SHA-256 98fa226b1f17e358…

MALICIOUS

PDF

77.3 KB Created: 2021-09-01 17:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3802e1e2899921616e38ce3460fdb97e SHA-1: 5eced2765f8d3505f1c5814fb3f3147740b23406 SHA-256: 98fa226b1f17e35817723b3717c99ee53b1580237054e67fd149f0d0dcb77055
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis suggest the PDF is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/450498cfc67ce9929e32592d76aadb42/98772622349.pdf In PDF document text
    • http://paraglider24.de/pics/fotos/1/file/48795794165.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/b9i8teg7jk6fepugsv9725cqq4/pudinubiditumisewut.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///fufoxepexine.pdfIn PDF document text
    • https://aashianarealty.com/file/12103282852.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/b14c5d8c2ee7832ae38e4f190e1b3d94/nunibiwepizosikoga.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/5a8bd9b31069a1742b259bc0d3ad5100/dotizoxok.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/wesaberufuvufoniz.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/gadutomezeboja.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612774e201af8---90605221755.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8b761614c4---9123254423.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d5ca8d7cb---80421127542.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/43255652192.pdfIn PDF document text
    • http://banquat.com/userfiles/files/1691953217.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/gagubotebij.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c8eacd6b1de---maduxa.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160762d6b25486---xogunewotemipemamuwojuj.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/webilaruxuvidasewol.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/86966823346.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/ffb1c33fa2ec8ed0a8cba02f7999fae3/zujalenugezunuzujasuv.pdfIn PDF document text
    • http://sbcnepal.com/images/file/jerox.pdfIn PDF document text
    • https://o-dance.com/upload/files/32761645800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+search+an+online+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a226c6b63698dc8a1e794f48d45d18e1/9702164008.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_off0000c9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DE 17472 bytes
SHA-256: f0d6991349df6973438d372ea18bdbd09c8f3b07a19d2c150986c45ec78b0390
font_01_sfnt_off0000f655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF655 10796 bytes
SHA-256: d83b262588a2ad32947b90bac0d8f28e8cc360f45651162cd526c4231b76d61c
font_02_sfnt_off00010f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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