Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb0a1192bddab676…

MALICIOUS

PDF

144.0 KB Created: 2021-07-04 10:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 80db500120450b1ec1310f1223ad065e SHA-1: 5b7c09dae17c61906beb3faaf1b881aab8e91d03 SHA-256: bb0a1192bddab676de0198f592d40c0d5c44c19ae418344339c4a3d317b762d3
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories. These links likely serve as a distribution mechanism for phishing or malware, leveraging common vulnerabilities in website plugins.

Machine Learning

  • Nyx PDF Classifier clean score 0.2028

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://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607965d212569---fukevi.pdf In PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/84230869550.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/a242db20e86797c956afc459ca27ee48/67650358621.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/su28n0jg73kt57ka8gfec0rq27/86477273427.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c609b5e4c3a---74462348177.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/d4ag7iqs7kouf49f1petqnulv7/sexit.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076970e62b8d---39116708481.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/6d1c09f88d919a7fe6ddbd4385827d1f/86381163829.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/40569458673.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160707b55098b1---52481891207.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/548d7e9fa4ebbabed1007fcfb0eef002/tubinavitiv.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/4d2d55badf988d9e25815256e134c501/77099489334.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/56042664536.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc4ba08864---27422225579.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/9dpk9b09rpl8mkokic7fc6pru7/58411476951.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/3723820026.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608529c77aa52---8916192886.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f060d242b5---zurokowa.pdfIn PDF document text
    • https://tosto.cl/ckfinder/userfiles/files/11608474149.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7ed11a6ff---24833505544.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/e2201a0f5822ebd6ed99399436926730/sutafudijopin.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/65592620473.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/959dd57c7ccc9f7c2754ae11adb70ea1/burojegukumogagikufe.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b548b08858f---67635505454.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/0e024e513612f1b39ba3163320aa68fc/dowazurazakoxagugaz.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/15ac41bba33d0e552bc43ef24d75605e/91054481635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=history+of+modern+architecturePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F4C4 10900 bytes
SHA-256: 02697f266afd02db73f21aa2228a7482d72ed978dda73dc992dec096c6aab0a5
font_01_sfnt_off00020dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20DD0 19308 bytes
SHA-256: 55a7d021ae92d2ff78536a446b02665019eb89f1623b15ffee66a8f044663b56

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