Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a3eea9de21520d…

MALICIOUS

PDF

101.0 KB Created: 2021-06-25 07:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e81cccc2366535e85c71ec50fc8cfeef SHA-1: 781e73e6369da22c3ee91828c9f4fe07238df429 SHA-256: 61a3eea9de21520d12d01789a04572795cf66de214e3eb733c0dc71a2b4eae21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by multiple heuristics and a machine learning classifier, and is flagged by ClamAV as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs likely serve as lures to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://wastran.ru/uplcv?utm_term=role+of+media+in+disaster+management+pdf PDF link annotation
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/gn3io1nfnhhnkktlscd6cvnfl1/41389702640.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee6d2baca4---1278736005.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0676fe5773---kekajadotalejopixewek.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/hiedlhr26cij683orjtnoqbbk9/4804657263.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f0bb4cc48---sapalerilowuvi.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071abefdc800---7162581025.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54fc072737---mozebovegerebuxov.pdfIn PDF document text
    • http://jucal.es/images/file/sagewikanaref.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ig9g3osh3gn0nutgoq63c54ss5/58645175329.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/93b8c0f24e5ecabce136f6fdd3411344/zatunipazajasikeg.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/ui16c5rp2ei5ikkjm47edrq7qp/lovaxofotemurili.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/72122698884.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-11/images/files/69424728136.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad912f0d677---95294241914.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/b00d404d1bf5a376359db755e1288104/jimiserarupomi.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_off00014dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DC3 5368 bytes
SHA-256: 7e80be286b658574c541bae140de32c46f8d54332adbf4c2d270fad989490157
font_01_sfnt_off00015ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FF4 11544 bytes
SHA-256: 239bc20c98fb217c35b2e515d58520e81f908650f8ddd1a80709a6178b9c4591