Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ef0ed0ea706c56…

MALICIOUS

PDF

79.6 KB Created: 2021-08-23 14:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 354dac847f76a1a50151b89c92552e45 SHA-1: 0a927032a58d0e36d060595cdb8e504be78b0c3e SHA-256: c9ef0ed0ea706c56a90cecfeff55c1d47e20ac7061e9ace6c8d28a18ee757100
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a Pdf.Phishing.Trojan detection. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites, including a WordPress upload storage. The embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt, likely using a lure such as a proposal letter.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4208

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://wastran.ru/uplcv?utm_term=sample+of+a+proposal+letter PDF link annotation
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16080c9f3d2279---zewuvunagimolapozabulirag.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/42146263485.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/kuxomonevovezovelowusalo.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/84954120589.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/33262314899.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210705_3AA04DFE7E9C1834.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/73997611758.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/83801291691.pdfIn PDF document text
    • https://sealskinz.ru/files/file/kadipin.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/10313022652.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/87526808581.pdfIn PDF document text
    • http://parilka.by/var/upload/file/bobisamamunuverisil.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/69d35d389c883acc09d55023dd7c71f6/6679051761.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d8871aebc---39336732684.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/facf2358ec5a4b120f58651365bda427/10177118758.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16119187b7f602---59872081415.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/63665521630.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es//ckfinder/userfiles/files/gipitabiganizo.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086aa8d35e04---23197071932.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f082f79cab3---68508536082.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/netezonepikewixuti.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/9378414940.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/kunuwerofaliv.pdfIn PDF document text
    • 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_off0000eea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 17700 bytes
SHA-256: cd4b248734b3c819401be128c76ea9fa00b5b716b23725f9fcc0baa04f1e7113
font_01_sfnt_off00011d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D08 10396 bytes
SHA-256: 65b0498d772dc3f4e3328a0ee34d3a15fb81947a6008d0701b323ed70d7863d8

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