Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c5e5ac0266d242…

MALICIOUS

PDF

62.8 KB Created: 2021-10-01 18:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2233c10a9902cf17092d5fcc5115bd13 SHA-1: bc9e02e9073da8b66522f39050cc4468518ac627 SHA-256: 40c5e5ac0266d24266f2c3183199a313237ef399ad76b33bf1f6ab01ab0b6bb0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high score strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6868

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=vpn+apk+download+mod PDF link annotation
    • http://klusjesindex.nl/images/uploads/65061090463.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/velifasip.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/savikejabilukoli.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c947b2a47---70990213180.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0035178001632080555.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/27544642141.pdfIn PDF document text
    • http://corkpotters.com/images/38678154776.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/21157755070.pdfIn PDF document text
    • https://ywint.com/ckfinder/userfiles/files/1633018725.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/46616176244.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/a4730cb1d9dd560bdf68290d3edcc091/ketisox.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/rimodel.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/67887644153.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/refukonufekorata.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/15162482254.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16153c8aea2931---64301889088.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091700373143.pdfIn PDF document text
    • http://industrialdevices.in/uploads/9775896861.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/welirasufezugubusej.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/94126713516.pdfIn PDF document text
    • http://boldogelet.hu/media/xegikata.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ab73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB73 14408 bytes
SHA-256: e2c6f510a04452b1f2a6ff5618cb889d4234a102d86a981b5e81ed3dae23c593
font_01_sfnt_off0000cfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAD 10112 bytes
SHA-256: a67d648a577b4b879416fbd81d2c62858f38947b560c3b3305511fa233e2c580
font_02_sfnt_off0000e634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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