Malicious PDF — malware analysis report

Static analysis result for SHA-256 c66d76fd6e5ccee8…

MALICIOUS

PDF

60.9 KB Created: 2021-09-16 05:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2d404523a2a986e4386eaabc378cd6be SHA-1: fec8a326b0686dbc6f76b1b55cdbe2056e0a832c SHA-256: c66d76fd6e5ccee80b4549e79bb6e2131e94ba8e2fe256d3ebae48dbd38cb7fb
154 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The document body is unreadable, but the presence of numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9446

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 http://kerama.altrodesign.eu/ckfinder/userfiles/files/kapagenojajirig.pdf In PDF document text
    • http://gu-bo.cn/uploads/files/18483260627.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/vibarizepabu.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/7260898764.pdfIn PDF document text
    • http://thepducphat.com/upload/files/laxadazazaluzafovu.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/12319426528.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/86673301990.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/79055471285.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210912_D71F3D9938B8C5A5.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/niwuzawiwilonipavumo.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/jenibonimonifekesugi.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/butekimidipaxu.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/5036195744.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/vamizexezonigegewomija.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/zesidunumoxixodap.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/71910249722.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/d7a60f54d1a1752750937107c10f9e12/78018169817.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/e7099a30b6b91213f11377cf74c1cfb5/59286360583.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/17663620617.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/99246447870.pdfIn PDF document text
    • https://dellrein.ru/content/file/soxaku.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1612f227f6568c---44797338137.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=archived+sms+messages+androidPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBA 10720 bytes
SHA-256: ce5c318d1211529174a7110a06bab331e4821b6edfb09b6bd3bdf8eb07805cf6

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