Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18cb95b7fe7cd70…

MALICIOUS

PDF

88.7 KB Created: 2021-07-01 23:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c18c356ff581a7bfd06da05831b2f18 SHA-1: 8486360d41738fa35b957a29516902a487c61088 SHA-256: f18cb95b7fe7cd70374e8f33188261c1728f7b722503edb30e61082015717b2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or trojan distribution vehicle. The document contains a link farm pointing to numerous compromised WordPress sites, which in turn host other PDF files, suggesting a multi-stage download or redirection scheme. The presence of external URIs and compromised CMS upload links strongly suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cnex.cc/images/blog//file/wimekevupaz.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/745c39c6265864da4734febc656cc07c/waxajusopejifudojotujigu.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c069b1eebf---sijusaxigasani.pdf
    • http://robinsonfamilyreunion2021.com/clients/7/77/7769cd5c98d63cfb9738ae2db1c5c42c/File/33135412082.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec07fafd5f---mewiropukigeno.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833dbb22c41---lemevepuxopakemovosaz.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/imsqatsln0ms80jio9gso202j3/98675344917.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd737a8dd50---42122477942.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/8bf7b5d9ac36e05506b7d89e6f1a9ff6/45162734612.pdf
    • https://devcons.org/uploads/userfiles/files/51223821055.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/7206209c14f6ec22a6ce483c235bb9ed/seturo.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b30d234f9fd---jivuluzigirava.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/aade8565961df98a04fb810ce564433b/bimotozilijizigozerote.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a87b80959f---45541631283.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd4de7f6b9---56396854956.pdf
    • http://suamayin.biz/userfiles/file/baniduvutipopapixurot.pdf
    • http://le-bouquet.be/userfiles/files/29446076108.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/33d8dd7f96abc0077d3e954ec7b2c0dd/wavikukegobume.pdf
    • https://pepinieramontana.ro/ckfinder/userfiles/files/62591962802.pdf
    • http://kingsfinancialconsulting.com/userfiles/file/veweluxegaxilawagi.pdf
    • http://www.knickmeier.net/images/pageimg/file/75051889683.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/59541e95896403c3fa75dda3a61f66d0/bidivamadiju.pdf
    • https://africanresearchcenter.com/userfiles/file/xukuwa.pdf
    • http://xedaptap.net/userfiles/file/27377763203.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091bb940b7cc---dosimusixaporusukozuwelu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=gail+from+the+hunger+games
    • 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_off0000f6f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F6 16792 bytes
font_01_sfnt_off00010f08.bin
e31cb9f7728174a9e3b4182eb45f377b4d1cee345ddb3da6ae4422a90be51dad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F08 17516 bytes
font_02_sfnt_off00013cd8.bin
ef80489e3294cb159a9acf0e92ddb531d2b56ff0d0793ea459db3ada72f356ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD8 10800 bytes

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