Malicious PDF — malware analysis report

Static analysis result for SHA-256 9de3237ef25321fd…

MALICIOUS

PDF

76.2 KB Created: 2021-10-06 04:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6a0a83527333489b8b512e064945a693 SHA-1: 72a2a3ed52277dc4c4ec8060ca0b78cc4531d750 SHA-256: 9de3237ef25321fdfbc6933c697b79ac22bfc4178405649ae6a4a5653fbd38e9
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such sites for link farming, suggesting an attempt to obscure malicious destinations. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7569

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 http://cnfglgreat.netsociality.com/upload/files/bukuwiginuzifalozonawep.pdf In PDF document text
    • https://spyboarcams.com/files/sulaxageperofodovedo.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161444b064b2bd---juzimabifuseradiwudo.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/jirevoridanisirojawigape.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/difibigejuminanofilej.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/9kte0hpbeanqqb6k40qq9msuoh/68590418925.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/88170810249.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/guxusolupigutubekumekipu.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/galovaxodakixopev.pdfIn PDF document text
    • http://melvin.cz/data/74129556587.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/mamileg.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ogarumirar.pdfIn PDF document text
    • https://tmtteks.com/files/29450043509.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/nasovovukutemuwetinup.pdfIn PDF document text
    • http://brlairport.com/images/file/19279317563.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/tawodapifadujo.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/bomupodifekanoluxuniwiju.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/wobopixomanapegij.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27599111573.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/94666671645.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/79116307509.pdfIn PDF document text
    • http://temple.mo/userfiles/file/75691020510.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/21039350657.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b6ff245ed3---85108436600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=college+football+groupiesPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9E 19476 bytes
SHA-256: 3e1a4199abd4a7b74db2211409c6f56524687b94cdfb09a4ce61fdaf28fa1ed0

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