Malicious PDF — malware analysis report

Static analysis result for SHA-256 93f5c1caad51d765…

MALICIOUS

PDF

81.3 KB Created: 2021-09-21 16:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: d4a2f626ace1399ff4483a4c44789dae SHA-1: 000314cd942882ddf7c9f8936a0d570e022ad2ba SHA-256: 93f5c1caad51d765750f0fa9f796c67680e155c71ef99d4c67abb498f9f7c43b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many external URIs pointing to various websites, including those hosted on compromised WordPress installations. The presence of numerous links, some with UTM parameters, suggests an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=game+ps1+compressed PDF link annotation
    • http://www.cemeba.com/uploads/ckfinder/files/66419885950.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/lupupedawurupafo.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/rofik.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/nebedigafobixajatonufu.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/692195579.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/xarimexorixamidujonibame.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/kimolemulasifuzetuludu.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614409d3d5665---jefodeguzuzizalulo.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/wameba.pdfIn PDF document text
    • http://cudicio.it/images/file/20665667777.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/fosugogezufonufij.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/ratotidunudifetuzafoze.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/mewajegifozugugefazerud.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/fexovidadumawat.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/1338f914efc6f67cfe28da90ee355139/54082515345.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/5366577226.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/16535912083.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/28127894141.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/68777463562.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/vvgjir4i42ucjag49kpef0bb5b/73759642397.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/3a202d867fe15a3d7fe9d1c8515754eb/segolumuzirawilo.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/97705679283.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/bawimipiboburususadagex.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/48116126457.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_off0000d7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 10424 bytes
SHA-256: 54e89f3ebbffed36177e98811eec108082988b3c7ffafdcb8c1100107405efed
font_02_sfnt_off0001076f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076F 18328 bytes
SHA-256: 84970d54560081d5a9400df7d18fa0633e0d8a42b915b7c293f2828b045b10c7