Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed76405a8f7b081a…

MALICIOUS

PDF

85.2 KB Created: 2021-09-05 16:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5a916481687c37a1e6d1609130b37a2c SHA-1: c9437b373f087fd193ebccd1375d97d6e19ed247 SHA-256: ed76405a8f7b081a55ee51663e72bc821ca658239205239343faf4c47ab986be
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing and malware distribution lure. It contains numerous links to external sites, many of which appear to be compromised or disposable hosting, suggesting an attempt to redirect users to malicious content or downloads. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly indicates the document's intent is to trick the user into installing a fake browser extension or update, a common tactic for credential theft or further malware deployment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://archism.ru/uplcv?utm_term=best+free+pdf+reader+app+for+windows+10 PDF link annotation
    • https://juhaszautovill.hu/userfiles/file/34564327839.pdfIn PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/48075324444.pdfIn PDF document text
    • http://redactron.com/userfiles/file/56764489770.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/50582785385.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/11d87ccd8b7448fb7479633fc6b3354d/18297945540.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/d80e5dc1e0a65211e85e467005aa27b4/bipigod.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/c26e0f3a75a19386a9566d670292668b/99528271558.pdfIn PDF document text
    • https://motacademy.it/file/13527258798.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e98b90a92---20037107097.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/85490358493.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/a931c383e7b4dc7298e170feb24207a7/tixoromoluwopetak.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/77884790456.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609118b76a170---pajazeso.pdfIn PDF document text
    • https://migger.dk/userimages/file/gilalirurubazagopaliv.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/bpnitc2vi4lqc89l9ochammlar/retowoledanu.pdfIn PDF document text
    • http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/judezobamufipove.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kunenu.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdafd86bf5---fakubowu.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/ravulisofogotikuxet.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/e8rmhi1q0cvl2nko8902a8cu3a/99918713302.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078363c31cb1---37147977852.pdfIn PDF document text
    • http://kasargod.net/uploads/file/zivemilovajaliwupesivixa.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_off0000e8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DD 10756 bytes
SHA-256: e1f3f69ec4efbfd674085a924714ddbe652da4119e461b5f550adacfea0dda98
font_01_sfnt_off000101da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DA 17808 bytes
SHA-256: 490ee527c1b34cd5dbd870484e893bdf12c80acb193b19a2dd3a2b0420700103
font_02_sfnt_off00012f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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