Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d0a3a5bf3f887d…

MALICIOUS

PDF

79.0 KB Created: 2021-09-01 20:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c01209ab15457afd42fb407658be9b4e SHA-1: cb58ad9ed4f75ad2948e0e1442aa4fca7409acc5 SHA-256: 35d0a3a5bf3f887de802a54aa32e7e844c9fddc734149e06c7602180dcbfef2e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded JavaScript likely facilitates the redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5802

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://musclecar-taps.com/js/upload/files/75072671806.pdf In PDF document text
    • https://unicon-msk.ru/data/files/61898425206.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/7ciklmajifprgmqelnpshl2mk6/sixiwunubinizeb.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/gfv99137qjcr7c2idr1usci9au/33820998881.pdfIn PDF document text
    • http://xtra360.net/campannas/file/30443360310.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/xinarar.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/22912160444.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/dizuzorajasuzafefuv.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e6b96da92---61552008790.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/e6bd3332266fd27b15f121f3ee79b7c4/kewakibuwamifakerutemave.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/dobonamitulejakomaf.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d28279e369---91652931540.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d15aedbef---dufuteme.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/pedesebi.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/055df1bb915f2804cd82233c439b3b21/monulokowebigu.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/7eddc914e3b6668167bb8400f877a463/saradiresuxobapifozo.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/deruzinagiludanufaxo.pdfIn PDF document text
    • http://amajyuku.com/files/files/tafidabivufo.pdfIn PDF document text
    • https://soechi.com/userfiles/file/77079934472.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/jijeg.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2655a17913---xazuzafisek.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/doxupekub.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/jibojoxotedarudezaxub.pdfIn PDF document text
    • http://atek-ent.com/upload/file/90257710766.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/10582592082.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ae7823723---92255534466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=money+laundering+reporting+requirementsPDF 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_off0000eed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED3 11088 bytes
SHA-256: 6f73482f54be39067ad84b8f6e62ec53e47d19c17e5425bd7a77e5b7bb16e47c
font_01_sfnt_off00010823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10823 18188 bytes
SHA-256: 8f0eaa1d4bc8a93c54fae838ece579da1ca0d91e5c746a4f9e939b41fb2db26e