Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dfb5adc370130f2…

MALICIOUS

PDF

56.8 KB Created: 2021-08-16 14:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 736dd9b9bd2e6245f38bb228e48c7d7b SHA-1: b0d2bf55e8f63cc6a8ff9498dc6c3f48a7c462ae SHA-256: 1dfb5adc370130f2dcea2f88f3f50c5d6922545bf653840cd851a3dd9c95ec13
154 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload storage, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7142

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://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160e309919fbdd---kobexogumegomakexukuwelev.pdf In PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/refopej.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/diruvepulez.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082e7c1cf097---bazorotegekisalase.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/128937959360b6169fc4adb.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/disax.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/45592153031.pdfIn PDF document text
    • http://nature-revive.org/files/file/xetosinuwab.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/im90us4sa8vgrat6cajfuc0kn0/sejujudesezixupenowilise.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a121dd4ebbf---zupakavugiwujuninimekama.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/835d1aa6b96b7235cd57c6a2f595f6f8/7150577075.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078828798f9d---48328053112.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/83d9b9e239ad311c662cf502df0e3c74/sofigetuwofifamow.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/14182851840.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/1itok73on19pphetop2a9ebmsa/mebusaki.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202107281548028893.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf55In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=what+are+the+physical+properties+of+halogensPDF link annotation

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