Malicious PDF — malware analysis report

Static analysis result for SHA-256 810720da5f4307cd…

MALICIOUS

PDF

65.6 KB Created: 2021-09-15 14:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6b118422b3329b8c24eab678f392472a SHA-1: ead650d9a2879ceb262ec38221f6b0e36cddcd08 SHA-256: 810720da5f4307cd2584e1036a5ac3a1d7a06e29c004049af851db802fb4c231
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised WordPress sites and disposable hosting, likely to distribute malware or conduct phishing. The embedded URLs, such as 'https://inwebjor.ru/uplcv?utm_term=ben+10+xenodrome+plus+game', are suspicious and likely lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8344

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://inwebjor.ru/uplcv?utm_term=ben+10+xenodrome+plus+game PDF link annotation
    • http://ingegneriarossi.it/userfiles/files/sevakoboxujamixukemegise.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6ce8313d1---93740210249.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414d12dd780---terokuv.pdfIn PDF document text
    • http://cecev.com/stockages/files/sulowexonuwawepuwizanover.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/tezozibujito.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/28152941311.pdfIn PDF document text
    • http://fitviewer.com/files/file/jomugatoli.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd4b6eb408---82884540306.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613653f4456c0---68597017842.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/xiraxiwaronolavimupimi.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210914192056.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/lovixemoli.pdfIn PDF document text
    • http://art-ball.net/files/file/90268702770.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/20871233755.pdfIn PDF document text
    • http://www.og2c.com/images/file/44042354093.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/ridukiradogab.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/jugomimedo.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/xuririxixepokowemot.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/pikanidajufadepowat.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/21308483342.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/wumapubupidajusopito.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/66908397013.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/gurabitonavogaganoranuxa.pdfIn PDF document text
    • 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_off0000c798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC798 10976 bytes
SHA-256: 97a32153d7c850c6f1a6728d9105b2d1d22f6f9e4e01be7206db4a3c405694ee

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