Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc5c23116db4c918…

MALICIOUS

PDF

77.4 KB Created: 2021-09-03 08:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: a02b8f47cab211fa05065a99616f6085 SHA-1: 8fe8dcefdf425da4e891f857bd739d8a73ac1171 SHA-256: cc5c23116db4c918dd1a5e3bc88444b2cb0529311a4a10660c050a4567daf2ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://chcial.ru/uplcv?utm_term=converter+pdf+em+excel+zamzar PDF link annotation
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb41979cfed---54281936335.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/44338884400.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/95242424302.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/44482681220.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/watibutojosim.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/13154442885.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/3f7469b90fa6003a93400b400b426750/leminamufevowate.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/76808786432.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea304de01c---wotomezadimo.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ad826cccd386f2c76ea9821ffaec9f4/funeralonizawerebajekojo.pdfIn PDF document text
    • https://designclarf.it/file/dasajulozuwesinozi.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/remiwukupegowuna.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9602a6e86e---61060264926.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/18501083778.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/f5e70fd31d01c54eab862d3eddc8b66e/bobimelitidijupiso.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609277125d7f1---fobow.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/tezutozijexupixufa.pdfIn PDF document text
    • http://cosyromania.com/media/file/sevowumujigarebuzaf.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/xowelajerujev.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/pupevafusaputu.pdfIn PDF document text
    • https://irrisyst.eu/files/file/ravorudutunib.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/gapefobizeluzerikorujejej.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/ae31c711487555d5cfef39c1a51c1b32/gusope.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_off0000cb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB07 17092 bytes
SHA-256: 5211f546c538286525af720e690cd04e48659759d07e7898db06789a5eb0ab03
font_01_sfnt_off0000f6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E8 10780 bytes
SHA-256: 29eefc81e91c9fdba93540b04a04ec7522da2b5c40f5bf072c1c026f851d300a
font_02_sfnt_off00010fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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