Malicious PDF — malware analysis report

Static analysis result for SHA-256 13826c3c020a3f60…

MALICIOUS

PDF

83.3 KB Created: 2021-09-04 11:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fb5649caa4929cb0a9d214a212da683d SHA-1: 7ba4edd72c5fa3b2827ebc6b40ae719b4203ab1f SHA-256: 13826c3c020a3f6072580840e4783af8052f547735659904a86b69d914be125b
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress upload directories and other disposable hosting. The primary purpose appears to be directing users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/262661df700a198a5be4671d3fc53aa1/purox.pdf In PDF document text
    • http://watdoenwevandaag.nl/upload/2201832898.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/192badd14e86fd08dafd536275f8fc54/zawej.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/6398905645.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/punemubonakusizedarekun.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/57672210493.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/juzituropugejufofupafip.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/43401851374.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/13415214338.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/33501027633.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/b06ce45aefeb60491a629d93085a09af/52603242659.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082766797d83---geliguzogagiku.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/rumad.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/dusixos.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be9d7030fa---livisuvodibepu.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160f8c1a805215---31760145.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/32410976618.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/zunotonalitozozotuvalewo.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/redusegud.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/18216380757.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/vtuhaqpbvp75qhddm8srvusnsl/48433580399.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/sutemuwogefawimomizulaf.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/67827177981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=cognitive+behavioral+therapy+techniques+for+substance+abuse+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_off0000de4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4F 18160 bytes
SHA-256: 9ff533c56268d7a4a4bda29fc94745e20fd46d3a6ceb14aed93f3f210fdc9616
font_01_sfnt_off00010ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCF 11496 bytes
SHA-256: d4e3c2a3f2fe44ad3f608c2c0b2862e2a5ac84f3369d235a39401c5dd4a2aca4
font_02_sfnt_off00012752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12752 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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