Malicious PDF — malware analysis report

Static analysis result for SHA-256 445da9be4ca25764…

MALICIOUS

PDF

91.4 KB Created: 2021-08-01 15:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-12
MD5: 32c49eeeda721e8ef65656d91f77ea23 SHA-1: c0b784dcd30721b321b320dbea3d6da1a84be9af SHA-256: 445da9be4ca25764a001e6ee9dd1ac29aec430c470a939b362ba3fb98ab8e927
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms, suggesting an attempt to lure users to malicious content. The file's creation by wkhtmltopdf and its structure indicate it's designed to host external links rather than display readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://philabc.ru/uplcv?utm_term=xbox+one+x+skyrim+load+order PDF link annotation
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fde4aa7e0---34921225319.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffb1d94b16---zenukifasizawazabo.pdfIn PDF document text
    • https://airbays.com/userfiles/file/68088780609.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4e44dc681---32246889760.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/niguloxopi.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a4b915696---xufaforadigadifir.pdfIn PDF document text
    • https://roc.mn/uploads/files/21591050012.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/soguk.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071919b911c6---fiwutageku.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/39082edd03456333159405c851d950db/tizawezanurexopu.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609155b9841f3---taxarusuwigipizojoj.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/latisoza.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/8ae29e4caca3ff182ae2a7135c07bd92/64493854940.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/dugelidafawiweraf.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/9e4220a0f7b4f6261548dc6fd40dfe1c/75994384431.pdfIn PDF document text
    • http://baybayankaauamo.com/clients/c/c9/c9e0f772d4a556598cfa564a27137582/File/terusasafuwevo.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/zofulanugurinoloka.pdfIn PDF document text
    • http://usmleworkout.com/files/file/54484376710.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/32052329934.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/e5bf7fb5da175e17ca5cd3a2bf6fc44e/dixovekinuse.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/63988381967.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/39781225357.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_off0000ff72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF72 10764 bytes
SHA-256: 000d6c0d8a2675460601e46ccb399b0d23cfc5cd9cd611a39b71f488f642c4cf
font_01_sfnt_off0001182e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182E 17136 bytes
SHA-256: ab344a75561b29840422bde561b1639c3042dded188c13999ab4905cf2cf913d
font_02_sfnt_off00014520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14520 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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