Malicious PDF — malware analysis report

Static analysis result for SHA-256 b587183b1c8d3fb8…

MALICIOUS

PDF

91.5 KB Created: 2021-09-20 14:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3fd89d7f585ba0116de834c57324d0a SHA-1: f41d4315bd9241d699d03b2f4a8bca52545a2a4f SHA-256: b587183b1c8d3fb875f2c890245d76fbee8a705cdd36e4ba2e324efe0075dd20
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs and the heuristic firings are sufficient to infer a malicious link-based attack pattern.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2680

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://coretry.ru/uplcv?utm_term=application+screen+video+android
    • https://manhremhoangvan.vn/wp-content/uploads/files/vosusupatidof.pdf
    • https://zlataraburmevuckovic.com/files/2619220455.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614784d3c3e40---92812621817.pdf
    • http://autosoftware.company/autoresponders_images/files/tugedorumotuwoma.pdf
    • https://kp-bs.ru/upload/files/89810937740.pdf
    • http://hainfelderteich.at/ragexokodegifiri.pdf
    • http://theloanwala.com/userfiles/file/logisilevaluto.pdf
    • https://wojczak.pl/userfiles/file/74601576825.pdf
    • http://rund-sro.cz/UserFiles/File/14102040087.pdf
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/80553379351.pdf
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/fezalexegasomoz.pdf
    • https://mackbeks.com/files/file/48518060413.pdf
    • https://vaitinhdien.com/app/webroot/upload/files/rajeduvakeme.pdf
    • http://bainihu.com/upfiles/editor/files/87890694081.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136218363b5b---juxobiroloruboluxul.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145acbd87a3a---79684102850.pdf
    • http://tz5168.com/uploadfile/image/2021/09/07/file/20210907_160244_130.pdf
    • https://kratky.eu/files/file/rometokezajolu.pdf
    • http://noahmission.org/dataroom/file/lafamexozilumemabirinuxew.pdf
    • http://saluteebenesseresas.it/userfiles/files/97437187012.pdf
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/tajukamikafozawuwuvovute.pdf
    • http://upoart.com/ckfinder/userfiles/files/vowutumexobezomikuzazoruf.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613408cdee5bd---2281694267.pdf
    • http://envisystem.com/upload/userfile/files/tilekovifowezemi.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001188d.bin
ae24674428563d2578d9888423a42d43113b6a631a5077e3850c20c245aadcf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1188D 19172 bytes
font_01_sfnt_off00014a89.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A89 16792 bytes

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