Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0f5720eacbc46e1…

MALICIOUS

PDF

70.8 KB Created: 2021-09-06 05:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f844578e6a648d931a554b6a18b4bfc2 SHA-1: 36b8698fe3fe91010c05c01e4e8eb75ec672e56b SHA-256: e0f5720eacbc46e156d1efbdea02616552131632f5978b18aebfae5c7511e4b8
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites. These links likely serve as a lure to download further malicious content, as indicated by the ClamAV detection and ML classifier flagging this file as a phishing trojan. The embedded JavaScript is likely used to facilitate the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6872

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160811604ac198---67141063942.pdf In PDF document text
    • https://motiwalainstitutes.org/userfiles/file/gagurusesanakufezixesav.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/lenidarufenosanowapafif.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/f36c30d149c7564224a3d93108647096/64411088160.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63efc66d93---1424327748.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/kujisirixabolim.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/65459823612.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/d306b8ad478927d2ee2084412c2b1b4f/mimuxinusu.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4b044cd61---nezinuzopi.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe0ba94847---21178866703.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/44063113003.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/terejubevo.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086488299440---vasaletukiwamagafilo.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/ximusarodu.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/45111739429.pdfIn PDF document text
    • http://c-amc.com/upload/files/mikojeda.pdfIn PDF document text
    • http://planetamama.ru/files/file/41881546832.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/josobeterazivotaja.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/mapoloju.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/razugaputeseso.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ac70cacd4---9137305344.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/zetajuwegalixudipusoxo.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/le03tl27lfv3olnt25ev16buc4/lirogeleruvagotunirisadu.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/76269413562.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/64154195293.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=turn+email+into+pdf+iphonePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0E 17212 bytes
SHA-256: 941892c5999d54e5d014e60b84eba88f0656728f78de89720c280a2dd5432b72
font_01_sfnt_off0000f8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C8 10656 bytes
SHA-256: 58966447f04727b101295e6372c207c48ab7c0ae92d46e884be77fe774b725de