Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b08d008cbbf8f45…

MALICIOUS

PDF

64.3 KB Created: 2021-09-01 12:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e4b3bdc6f45c8dc34288df29b178d12d SHA-1: 6a56b3d0e75b4afc2060023f8b907e4e5e7dd447 SHA-256: 9b08d008cbbf8f4558ade352db1b644ca33292a4568e0d63fced237d36b92d60
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF viewers or delivering malicious content. Several heuristics indicate the PDF acts as a link farm, directing users to compromised WordPress sites and disposable hosting, likely for phishing or malware distribution. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7964

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://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160720e958e519---boletelijesopibevivi.pdf In PDF document text
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/paborelazegedikovikuvebi.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/83581166451.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/43938542343.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/60796410538.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/lefagaliv.pdfIn PDF document text
    • https://dprkoreatour.com/uploads/files/77955614797.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/35856571971.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210624120618302944tluru6.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/d4537739aff816782059d56c21671135/62826964816.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/xenezutokuzure.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/91b078e070acae5fda98bc2618ef112d/xuzelokubiseguxofox.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/46830797819.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/10644302514.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fbaeefc45---gulabok.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/jobinijelajepul.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/8aa179a9ab914bd711b1371fbd0833ff/32788939854.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210802_AEEBB41691B3A29D.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c75bc530b23---zadipazen.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/5381118267.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/31595310155.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/nedasitedufuvudefosexamum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=cbse+sample+paper+2021+class+10+with+answersPDF 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_off0000df37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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