Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a366a34e157a92c…

MALICIOUS

PDF

89.6 KB Created: 2021-08-25 15:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 52aed992302600a20387f5c6bded45c0 SHA-1: 60b977b9066a5a6bf7187c9b59936b957f525bb2 SHA-256: 9a366a34e157a92cbe01bb9d1599b73d91e4035768504fa18cdecdff50a90657
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning model assigned a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The presence of these links suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43362059742.pdf
    • http://vintageguitar.ru/ckfinder/userfiles/files/76996604671.pdf
    • http://duancanhotot.com/upload/files/dazokidafawojav.pdf
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/37703502681.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/h5dmhk1dd7b00ti9gq558apj16/55547238793.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608377d109c0a---kixejesawuvimi.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/f59e674a9dbb74340945bcd58f578f17/37168224608.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/73e750adb9b82524e68b0c1cfa476f90/dutigazoxa.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082d9a743998---bupivakotavubajonepolu.pdf
    • http://pinetreerealty.ca/clients/55933/File/1262028781.pdf
    • http://aryajob.com/user_upload/file/wavano.pdf
    • http://doorsatyrau.com/ckfinder/userfiles/files/64153195896.pdf
    • http://atut-biuro.com/uploaded/file/ligabezivatomobap.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d741f2172---jesoki.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/nowuxolerezimuwijoz.pdf
    • http://www.awakohchang.com/image/upload/File/9007808814.pdf
    • http://dexgerm.com/data/file/userfiles/files/mesuzodetoz.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ce258684c92---doxatokutijudi.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/93884036524.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160741df62e4be---mosovofasuzojonukiv.pdf
    • http://01host.ru/userfiles/files/27004877614.pdf
    • http://infinijewelry.com/userfiles/file/96635903852.pdf
    • http://onlinetradeshow.ir/uploads/files/19575886232.pdf
    • http://artsar.pl/userfiles/file/muzedexumadifaxivujekezol.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=shane+filan+this+i+promise+you+mp3+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f484.bin
0eabf4abebb6bccc474faee0e94eecf4002a53475524b614d419419f32b33136
pdf-font-stream PDF embedded font (sfnt) at offset 0xF484 11308 bytes
font_01_sfnt_off00010eeb.bin
bbc7411eda56d5b88d822cf0e4c9015232734067545f72587216667c044e4433
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEB 18116 bytes
font_02_sfnt_off00013d83.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D83 16792 bytes