Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d6f8bf1f61574a5…

MALICIOUS

PDF

54.7 KB Created: 2021-09-09 11:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 11a678a061992e8da1660d6dfeac7b8c SHA-1: 1a70edbc85da6e4fe39c49273660005111a7d19d SHA-256: 2d6f8bf1f61574a572521beed60cbbb041f8acfbf3eb58d9220cc94214c5f457
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Multiple heuristics indicate that this PDF is part of a link farm, pointing to various external URLs hosted on potentially compromised websites. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6885

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://smidgel.ru/uplcv?utm_term=rayman+gba+rom PDF link annotation
    • http://tfe-design.dk/userfiles/file/wanolerimipanamuvojoz.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138ff272cad4---38347444381.pdfIn PDF document text
    • http://freestyler.cz/img/file/4928756685.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349717ac782---5781341581.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130920253ea7---81376451499.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/volajuve.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82187073299.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/98447886816.pdfIn PDF document text
    • http://halanmilk.com/upload/files/nogugokixon.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/40963955648.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/3286186429.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5b1eeecfd---97570061303.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/dotavesifape.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/90108210113.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/49826627375.pdfIn PDF document text
    • https://asiapharma.la/files/files/weladosuxix.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/sijagezivadodemok.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vezanitotowulagupopolid.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/99468204204.pdfIn PDF document text
    • https://kawanmto.com/contents/files/kugisapawo.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd08bc4efb---gemav.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/96853860646.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/43833532548.pdfIn PDF document text
    • http://a899.net/userfiles/file/22328375234.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/rawewinawame.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/betatesojiza.pdfIn PDF document text
    • 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_off0000bc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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