Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f54980399959a63…

MALICIOUS

PDF

81.9 KB Created: 2021-09-02 12:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 005a45017535c23c064f5fc37ca39d0f SHA-1: 129245dd3b735994ea5c4d376a568aeb280ddc95 SHA-256: 9f54980399959a639b2a344642c54b8f626eea4625e2554a7b66ff151b3425ef
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content. The document body is unreadable, but the presence of numerous links indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.anapharmata.hu/ckfinder/core/connector/php/files/rogulaki.pdf In PDF document text
    • http://aggengr.com/uploads/CMS/file/35867695276.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/37050113591.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/5j4bisht1sfffklh6j2men2tdm/jiwejale.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/41b8bfeebe2da4d595097b9f84e9a919/botebuwilir.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/85231156356.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/1615374030.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/89554724061.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/54161296897.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/15551615320.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1623519860.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/f724ba10c42aee64f2ded1d750fd1d61/391882108.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/9067221655.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/denujezedurujamufejuwofod.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/b2jenokvheovvpi90d14hd2r0i/86200113762.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609886c6e95f6---3240798179.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/7f062ae899cc34564a5dc6dca465307c/69436739889.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/38573706709.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/61638333076.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/fb25507037488a5e5120f5b151094e18/losifimesemupo.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/1176197247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=statistical+analysis+with+r+for+dummies+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_off0000d7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EC 11260 bytes
SHA-256: 831ebc3b40c6711380e1805c145db654756e55d5af554881b00e8643f6c9a4a8
font_01_sfnt_off0000f22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22D 18436 bytes
SHA-256: 3968d3d32e2645fac90aabe7b970e878dc80ba8121276d3cedb09baa9c2d7037
font_02_sfnt_off0001223f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1