Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c9ea58ec9b2628d…

MALICIOUS

PDF

88.7 KB Created: 2021-07-07 18:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9e44ad1516f1850d7f605b63e31c7fc5 SHA-1: 8db419816bb139351fdf6837323444cae71bb0c9 SHA-256: 9c9ea58ec9b2628d0f21840e6571195a58cdf6aa48622650e514f471cd5fa3df
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting services, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

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://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/wafafutusipilutewuwuga.pdf In PDF document text
    • https://gw21.ch/uploads/userfiles/file/20914827230.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/bolewitigutobexunujavijus.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc36d6cb0d---5676605779.pdfIn PDF document text
    • http://fxmeat.com/upload/file/29fb1256a3f54dee7040e90ac5df2070.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/lq1itu6snoih1j7u1dgfrjlo71/40525739154.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/rubepatipaj.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/3kblqnru3cd8kti4u33nf8md27/tuvupaj.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d740e64f521---sofudapazoneweked.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/6840c53b23fe82df7822c4be98acf10d/depetufaxipopuz.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079735810c5d---65686428245.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/folusaroso.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/mudor.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/2a743d6d44ee88eaeff54f2f6c516318/62815781972.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/popixovuzusasas.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/2b4d5c17bfc6f2e01b8085733c9fb079/remewaled.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af6971122a2---42735328637.pdfIn PDF document text
    • http://immopolignano.lu/images/voripomalowud.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/2q2apoaj2ps9vvejp77upv8qml/34271193943.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160926969b7095---zidikore.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/sexeluva.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/021351283204.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/8a4a954a4bb059325efdaf543240156a/vuruvamuj.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074acebc9fa1---pobutujanapukepetetaforaj.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbef21d4eb---xexixub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=ham+and+cheese+frittata+cast+iron+skilletPDF 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_off0000f521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF521 18012 bytes
SHA-256: 0f20f3747aa0f778eb03218549363b8bf9eb31ca2535043b36e2702dbe10136b
font_01_sfnt_off00012479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12479 10824 bytes
SHA-256: 99ff7bad242f94905e8199273e2d32d5dbf04e837b3e1791fb62ac1944296a17
font_02_sfnt_off00013d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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