Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a0830661b3e9c59…

MALICIOUS

PDF

93.2 KB Created: 2021-09-04 23:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7bd6a1769e36d60a29effe71249c2bd3 SHA-1: 6b349d54c4908ebeca9546c1f387dfe78ceee9c8 SHA-256: 8a0830661b3e9c59ecb511878c977d1c616a87bbbccb2fa3cc26d3eb67e78853
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting domains. The primary purpose appears to be directing users to malicious content, likely for phishing or malware delivery, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://tantex.org/tantex/tantexuserfiles/file/29660583491.pdf In PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/ski9vbpd5rdvvkm8or06c55u4g/48645808933.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/17483346319.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/2a280bab3db5aef61d1e28cae61b1289/letis.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/25455491712.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/mamiwijuzejagozo.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b586548165---42788278731.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/46565957977.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed9a4cf2add---14762347575.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/wogokupowufuzorusilap.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/bigigafavasozozene.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/31oo2do4i41blrdkrtjkag7sca/karajifivom.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/clr2ggul2chu8svs824lafup53/foxojezikuwutonida.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/ji6m6pa7psn9i9pqgivsjnor9n/mexoxabiped.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/95077203166.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/qtn3a42lvfb7u543dbjtj5b04g/50409285555.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e012cb7706---fumidupatir.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/e83a8fafd2e6352ce0b5fcd7fe2337dd/64664467703.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/br2jnic5qfrm4f361r8trmlprr/81556807834.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210612082127_94ihph.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/60798106410.pdfIn PDF document text
    • http://servmed.net/userfiles/file/63397083974.pdfIn PDF document text
    • http://twilaw.com/files/files/tibubajepiv.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/50038043472.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/d08df0c3895484d9a57b6e624e46211e/9435360771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=physical+quantities+in+physics+pdfPDF link annotation
    • 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_off000105b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B7 10860 bytes
SHA-256: f463f7a55d4fd0e54fe33f8ebf42ca1ee766c6f28107d448d92c6b80ca2e4cb6
font_01_sfnt_off00011e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A6 18512 bytes
SHA-256: 4649e6f260ebfc8b2334b89ae08f54ce5b271d31c5e413a1056d33ba1c3941b6

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