Malicious PDF — malware analysis report

Static analysis result for SHA-256 10265350a314dc5c…

MALICIOUS

PDF

69.4 KB Created: 2021-09-13 12:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c60d8bfd7244713a92183b7a7e4a50e0 SHA-1: 7f30ab73103ff2717d29171a414284f07a953eed SHA-256: 10265350a314dc5ca9a555e92c6a90f04cf4d7eb6d5b3df2f7c6e5781af08a77
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript and numerous external URLs. Heuristics indicate it's part of a link farm hosted on compromised WordPress sites, designed to redirect users to other malicious PDF files. The embedded JavaScript likely facilitates the redirection or exploits vulnerabilities, contributing to a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=how+to+print+different+pdf+files+at+once PDF link annotation
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613536f96e80e---jatogekojimuxogef.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/jimaviru.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/p3v6m4gnr5oskspt4f7d10s472/91742093112.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/35518207750.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/tuzetezafikavetid.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/89959241017.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/fa8c56d843f71b4700b833fb95dc273f/xaleraruwofadexiravup.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/pukisawiz.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/14965700377.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/70392846702.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/6810335617.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/dejuletavamimurereji.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///95293050115.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/valojejebuvetirazix.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/lijajogiza.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109111809473148.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/81760601779.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/dopobopamegatun.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/xipemepinali.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/57637619563.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/6702427517.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/5abe59aa7a20588977a1cdcf7cc99e13/99494334219.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_off0000b255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB255 14752 bytes
SHA-256: 44650c0d9a946f01c86e2e80b441a61a5ef8e42901ca55bf7e1d619201777fa8
font_01_sfnt_off0000d731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD731 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF48 10688 bytes
SHA-256: 8721956d506851f335b515a1551377f257353b8c8679aa4989085951225688ac

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