Malicious PDF — malware analysis report

Static analysis result for SHA-256 736789f0ca60ab4d…

MALICIOUS

PDF

77.9 KB Created: 2021-09-17 01:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f7d20418b074828a025cc0db8dd49441 SHA-1: a86df116206e94ec861a7cdf14f158f2d9af9bf3 SHA-256: 736789f0ca60ab4d19a04d393f955d0590eea119da3b44e0fd8a292a20be8f95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://irlanc.ru/uplcv?utm_term=peliculas+free+en+espa%C3%B1ol PDF link annotation
    • http://klpa.net/userData/board/file/vegazer.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efac08b2bb---22290940725.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/pemewekater.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/gejorukefopuz.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/61806441086.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/24522668730.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/71376160393.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/zasajeripazujidodepixux.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/fuvadamulajodalisirekudak.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/61073981001.pdfIn PDF document text
    • http://vce34.ru/attachments/file/pabizeled.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161408f998e1e7---72105130474.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/bejaxuxizotafa.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364ad2db6a0---vejigujubedabexavo.pdfIn PDF document text
    • http://learningkey.org/userfiles/dopotod.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/63473797259.pdfIn PDF document text
    • http://hbaoge.com/upload/files/xowabujozivajove.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/63218941394.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/58809583623.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/63442726037.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/temazabujasom.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/vibobudunetiboxisabuw.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/14378613164.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_off0000c694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC694 10684 bytes
SHA-256: 89d75b2f583449b836730b2ff2d7b3bfc00a012e27c3fe60e85024613d82517d
font_01_sfnt_off0000dedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDF 19160 bytes
SHA-256: d2bc7d9c072987a36cf80e24f1e344df64f28b4651f0a04f22f4d236e7f3191c
font_02_sfnt_off00010ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1