Malicious PDF — malware analysis report

Static analysis result for SHA-256 3563bf7276bf0bc4…

MALICIOUS

PDF

84.0 KB Created: 2021-09-17 16:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 302459bcc62f97fe748302bdab55d41f SHA-1: dbf90c211a83bd188a83c20f13da8b4f9036d147 SHA-256: 3563bf7276bf0bc47d5964174d68c3510dffeb634c5c2731384d91da77846d8f
196 Risk Score

Malware Insights

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

This PDF document was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and malware distribution lure. The document's structure and embedded URLs suggest it is part of a link farm designed to redirect users to potentially compromised websites. The primary attack pattern involves a social engineering lure prompting the user to install a browser extension or update, a common tactic for credential theft or malware installation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://medvor.ru/uplcv?utm_term=download+xiaomi+data+recovery PDF link annotation
    • https://www.jdconstinc.com/ckfinder/userfiles/files/xarirenajorowirodukipuz.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba0abe4c25---sufigerefo.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090523545839.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/14639192709.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/35339502824.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/tinateroduxoludowod.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137daa79626f---33732688171.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/65803329179.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131dc30c092d---45598600543.pdfIn PDF document text
    • http://palami.by/images/file/petodig.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/4bb1b8b346ee05eb7d4ec6a9c4307a47/2095187310.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/siwufidijuvawuken.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/zesujojaxexadekidesox.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/45520523531.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/xafalomawamefovosa.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/2579521730.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/32489402116.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/19486027288.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/36744072114.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/norisixopufada.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/36411382860.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_off0000e39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB1 17912 bytes
SHA-256: 1ab90d45e9e4f53bec5f4b92f2530d67f3ef06cfbad149d57798cc7e56d81c1b
font_02_sfnt_off000129bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BD 10732 bytes
SHA-256: ec441bba6747d9b0e4a16ac03b6d82652ac84c8ed2b977f6f38ae082b9f46967

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