Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e69c91289687f2…

MALICIOUS

PDF

66.5 KB Created: 2021-09-21 07:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ef0313d33b9e8e0830af064c03fad9b SHA-1: e4f19bf498111277f551b802b258aca6f60d0507 SHA-256: 91e69c91289687f2ec2e28c0ca4ff779b5810529de81fba0a7b2d2e8d6e15581
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external PDF files, many hosted on domains flagged as potentially compromised or disposable. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users into downloading further malicious content or engaging in phishing. The document body is unreadable, but the heuristic firings and URL analysis point to a link farm designed for malicious distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9512

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://pt2-turbo-j3t.com/contents/files/73901063888.pdf
    • http://fecirturizm.com/resimler/files/xavedolo.pdf
    • http://polymer-optix.de/userfiles/file/nimabasuve.pdf
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/ginoxotafuvekikexilib.pdf
    • https://observatoire-omic.org/documents/file/xapadubepu.pdf
    • https://www.aukuras.org/ckfinder/userfiles/files/36690970657.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf95b4dffe---84266133853.pdf
    • http://mamtomchabahai.com/uploads/files/files/46786773305.pdf
    • https://worldtradezone.com/userfiles/file/mawimolexagosinexivinem.pdf
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/zugijizoli.pdf
    • http://www.wiz-fac.com/uploadImg/file/81657332828.pdf
    • https://autoradiator.mn/uploads/ckfinder/files/85458509314.pdf
    • https://888nv.ru/userfiles/file/rujaduruzut.pdf
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/79992807511.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145705e46dd0---vufakixotosorademakivapex.pdf
    • http://www.pattyn360.com/upload/forum/files/solebek.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eeb6dae0427766e995e8841bf54834a1/tigiga.pdf
    • https://dadrarad.ro/userfiles/file/xanavupiforatavaderagitu.pdf
    • http://busankid.com/webfiles/board/file///62046699646.pdf
    • http://affectif.ro/data/Image/file/86068525906.pdf
    • http://studiorumeo.it/userfiles/files/wovinuninarexewukobeda.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614139e9c3348---63301413109.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ablo+download+apk
    • 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_off0000d645.bin
8869416a29474adef9a8d47754076b47e640487ed9ec89bcae7831c41ccf5a26		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD645 16812 bytes

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