Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c62e0ac3abf341…

MALICIOUS

PDF

87.4 KB Created: 2021-09-06 10:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 325de9d641cf98dd85f9d68137b3bd42 SHA-1: 916b403301815dca3c4a622c91b8fa9c99f65018 SHA-256: 90c62e0ac3abf3415680fa44de9c1a54fa7ade821841b1055b5e279d3b8b3c98
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, likely serving as a lure to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6303

Heuristics 5

  • 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.
  • 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://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fde389307---38080384236.pdf In PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad35012c0f---mikedevitaniseguvosevawi.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/sajoralasu.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/virovewurupisezopuwazaxu.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/38827746787.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28462480671.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/48062247227.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/75414747072.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607c980ccfdd3---3237355736.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/1011104850.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/zegemodovoliwizoziwawax.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/23642389575.pdfIn PDF document text
    • https://avenue102.com/uploads/file/zovilije.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/voxiwuzaradebofariruzebed.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608759f699774---fisozigamesovonimakeg.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/4a8d45fe848227f07ddc0ddfde5e8f6e/dijotukabufaminu.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d70446adf---bejepuzediz.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/5f00d636ce3b56892c756a32849c1223/68772158370.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/86239175004.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/26635497267.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/24044187183.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/17467767028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=euripides+medea+pdf+robertsonPDF link annotation

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