Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77062ad8fbb59d8…

MALICIOUS

PDF

100.5 KB Created: 2021-07-23 23:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8eace59dbdfe522a766a841a316ea147 SHA-1: 7d7418ad3ba60bb12da7fe4da506d1841be5a140 SHA-256: c77062ad8fbb59d86f35c4235d9ba607a32b2cd6cad9977a915c0cecd84486d5
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to numerous domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and link farms indicates a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/83648007063.pdf In PDF document text
    • http://vistobrasil.net/uploads/file/sexemawojafenovawutubapij.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/11183597707.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/17bedf3ce4d7badc46f37ada76f6b4cf/88010911078.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f161d01020---daralajogulepitetetowit.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/sumalegujelefowulejebe.pdfIn PDF document text
    • https://giovannicaputoboutique.com/file/32341189760.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/reloranutimesorux.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/8069200184.pdfIn PDF document text
    • https://welltowork.org/wp-content/plugins/super-forms/uploads/php/files/d59182608343f5f519300c5e7289ad75/jugokejilokipesavad.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee9bfb7819---gavepinunubupezojefef.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/0e6977c3894a1039a4790c215363694f/21817133986.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaba066b9f---74976830647.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/59022010564.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db48915c8e---84565607256.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/5655913664.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f619005038---38820752157.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/p1t19p6pn2c6u3rf21e8on9bqe/90829780512.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/70644356128.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f2a0f87aa81---gusixamelawaj.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/ee24ca0b778657237899e541f9b4fffe/19154945245.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/29224388980.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/d61b0358cd1666adcc37647124b2a39d/50758202115.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ccaf3d880---99635725274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=college+football+pick+em+cheat+sheetPDF 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_off00012272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12272 10988 bytes
SHA-256: 74b4fe42a9f7eb379537e7238fe72d2a5b1e58d1d90583db20d773312e3270f4
font_01_sfnt_off00013bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD3 17848 bytes
SHA-256: b46e1d8a8277556c47e0089193c27751dbec8c5533e2f4a2af120b897f700978
font_02_sfnt_off00016af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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