Malicious PDF — malware analysis report

Static analysis result for SHA-256 79600960bb164077…

MALICIOUS

PDF

69.3 KB Created: 2021-09-16 05:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4aee82e080eef3e1a4cd7b45c97dc896 SHA-1: 7592c318397cf24d30c8598162be54698a057081 SHA-256: 79600960bb164077489dc43408bac9e3bd8805eef2abcbbc29d951711a4c7c0a
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to websites that appear to be part of a link farm or hosted on compromised content management systems. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is unreadable binary data, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6107

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 http://elsped.hu/files/file/dapuritifabitixa.pdf
    • http://mywayrtk.org/userfiles/file/32180133744.pdf
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/fudelo.pdf
    • https://sproname.com/files/userfiles/files/wovojosag.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/5414730d07969af33b14ce48ab6ee026/zegoratubu.pdf
    • http://apvn.info/userfiles/file/59813130457.pdf
    • https://hojoairport.com/images/file/61924713661.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/23210534656.pdf
    • http://duocthientam.com/uploads/ckfinder/files/28518233359.pdf
    • http://st-communications.com/ckfinder/userfiles/files/fefuredaniwokagasugigit.pdf
    • http://studiovalentini.eu/userfiles/files/wufafexodepidesamire.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1613577d161ee7---zopodopisejexigukun.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd75a130aa---27192498790.pdf
    • https://dbjadow.pl/attachments/file/dowoxisem.pdf
    • http://malifer.hu/upload/file/lotapuvubibo.pdf
    • http://venusland.vn/app/webroot/img/files/31786520137.pdf
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/ximojobolufelira.pdf
    • http://bumsnab.ru/uploads/files/75241640158.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137834583c67---54858168499.pdf
    • http://laibros.com/ckeditor/userfiles/files/pusonira.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/fe03c07ab1a57e4c6bd0b9da3e524ea5/birodovumubifiz.pdf
    • https://mandarinusa.com/userfiles/file/1631471294.pdf
    • https://mimpishiosatu.com/contents/files/25380273134.pdf
    • https://debo-fit.be/userfiles/file///bejojuzotetejoxisij.pdf
    • http://swhos.com/upload/files/50755101539.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/df85df2f1427945dcdf4aed41897aece/vozixel.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=remove+password+from+multiple+pdf+files
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e703.bin
86c5b79b9ec65806c91fb47a48202a82676b7dc2102d3303bda97f7f230840c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE703 18492 bytes

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