Malicious PDF — malware analysis report

Static analysis result for SHA-256 929d7399c11f02d1…

MALICIOUS

PDF

88.0 KB Created: 2021-06-11 07:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 70827f0e103079a05095498b2a242d3d SHA-1: 29fd4f74c5168d4a18b59a58862e080153518017 SHA-256: 929d7399c11f02d1199dae089c226b85c98f1e984e8fdc1190e57def6910f006
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=download+pokemon+y+citra+android PDF link annotation
    • http://aftckwt.com/uploads/file/23818615138.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871e3928262---74698432474.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/57590444758.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccc381636c---66562607062.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/63498190762.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/a2bffd0df779f8615c9b9b696bb9dad4/pevupobega.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609207bc6e424---bofixefadukoto.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/5893c32fc5e995336d01175af9676bc7/74335949612.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733dffe562d---gutolariwuwepukaguwufiw.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/9dbb4310d9f4fe139e08908191c08484/nuwatawogadagifojokeru.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/50287461863.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/50247258980.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/cba904bbbfc5b33d63ce275039e9f2b6/piwekomamewipobebeginig.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/6397n52nrcskihj2vs45c599p3/5399296468.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/fe52e039b8c8800b77bf599b815d162f/80660478314.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/6b904d7347580f2c03f680396ebb1676/xelisojikawus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7A 5300 bytes
SHA-256: 81836b9cd8e62feb3490c7a46afb5659d99f34733bce08e1b7022207195c9363
font_01_sfnt_off00011d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8E 22244 bytes
SHA-256: 300df17d5344d6a2877a3f1fbde7a6412945da55b6c4a22ff0bfc3101b3acd2b