Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ad91ba73d2074bf…

MALICIOUS

PDF

76.0 KB Created: 2021-09-04 21:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d0a5784d223ad1bf45f58b344be2c065 SHA-1: 4256792e7bef0374e96a101537bf3fa6e0481fab SHA-256: 9ad91ba73d2074bf8a6fafa68522e419aca4ee29a5a33d0004db9e2d4b55886d
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it's designed to lead users to malicious content or phishing pages. The file's structure and the presence of multiple external URIs indicate a link farm used for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=hsc+economics+question+paper+2018+with+solutions+pdf PDF link annotation
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/3uh37p3tcvqba65m25taom5pr6/barubutenibuvikubebiwemos.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/85837455077.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/de2dfaadc39d35c84ca9927438bc0c35/doxivoxufulowuzadito.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e97da809ba5---xatomuripatirapakile.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/ledipelegezojenose.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b094371f096---86625791267.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bab24ae4d50---xuxubaxazipotapig.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/mapafifekele.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d5ede092b---17260693914.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/nnan573ftme0qp8bguo95jonhi/kukexujinigelar.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cab57be0a5---mapilefiwitutimu.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/k4nq9u4buig5bj8c7rjsdgm2t8/91732098543.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/22216282395.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/20570364515.pdfIn PDF document text
    • http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/90750243951.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/pakabuvu.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df1c99b271d---lenizabolijukixazit.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/risejexigimikap.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/pevopeziburesavix.pdfIn PDF document text
    • http://anm-av.de/uploads/files/51966826068.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609aea9cd6976---58014023644.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129bc08443c0---bisabo.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/vngqvasaj0skb7sdrmfdp71uic/wosejatejirupifu.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/dedinixusujug.pdfIn PDF document text
    • http://leguido.net/files/takugo.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_off0000be01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE01 19296 bytes
SHA-256: 54442635110fd169519c7f057184756cea60f8e4e552c7a33cde4ad9b8223d08
font_01_sfnt_off0000ee10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE10 11708 bytes
SHA-256: bb831fbd9d35aa08678f67bb24766518c8ad89824ebe6e336da8b60933982ae1
font_02_sfnt_off000109a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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