Malicious PDF — malware analysis report

Static analysis result for SHA-256 c66608c88d49630e…

MALICIOUS

PDF

80.2 KB Created: 2021-09-21 07:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a4e34c7674ee65a22223bc5341201b33 SHA-1: 75aa3ea2403e4758c98fe0daf9035295956a9aa4 SHA-256: c66608c88d49630e61d61d08339867f1c914a1b312047d7e4a413c634c84c4a8
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple domains, including compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5588

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://huntic.ru/uplcv?utm_term=how+to+get+extensions+on+chrome+mobile PDF link annotation
    • https://radio-clipa.ro/userfiles/file/4491918015.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/56636505764.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/40767165643.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161453f7ada316---16253737751.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613548bd2f52d---673661393.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/72416521193.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/23748965145.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/70669987258.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/tofubazepil.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/nodotova.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/fezafupazudadolivesofo.pdfIn PDF document text
    • http://ashioke.com/images/library/File/jexopolalijuxezapixajobik.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/81916333724.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141b6977d1d5---26643687758.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/d4b468t5ehfl7qf235k1106pj4/kogenibovolimofiva.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/tidabela.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/debesosolegukirerozo.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/lobolukojel.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/lajezulajozita.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/48193747084.pdfIn PDF document text
    • https://maviet.vn/upload/files/supepeteginigogi.pdfIn PDF document text
    • https://mashura.co/userfiles/files/10897113978.pdfIn PDF document text
    • http://gtshotel.it/images/file/78160096296.pdfIn PDF document text
    • http://espokebar.com/uploads/files/xatadanawinuwopilo.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/wopufaxemo.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC90 18212 bytes
SHA-256: ff9c555c45627803a023139e39c0265c513cd94e317d8d3f5818ce4765df9ebe
font_01_sfnt_off00010b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001232a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232A 10836 bytes
SHA-256: 64386d73c766a2c0a94e806feebc832c0279c4526e57fbee8fcc9a48cfeb756a

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