Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3ba01fdd66eeb7…

MALICIOUS

PDF

66.5 KB Created: 2021-09-21 15:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ac1ea8d9b44f2403c0d136aaab007546 SHA-1: c3c7cfe53ac0685d239d2e93248b46e24c95bcf7 SHA-256: ff3ba01fdd66eeb7445656decf9b5ee9ba0393c75eae8c1ba6d040b9a185ddfa
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable hosting, indicative of a link farm used for phishing or malware distribution. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7151

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://chcial.ru/uplcv?utm_term=aesthetic+text+emojis PDF link annotation
    • http://tks-forever.com/upload/2021/09/03/file/jatovetakusudobimozave.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/50338982918.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/81483147928.pdfIn PDF document text
    • http://jar-ted.pl/file/kamujevejowonudinat.pdfIn PDF document text
    • https://limadelimon.com/images/file/95702287263.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/17/lazekusulutenunitodima.pdfIn PDF document text
    • http://techmechengineers.com/uploads/56768859653.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/31231963300.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/31338940673.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f670202b8---xifaju.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/71183265292.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/11559275123.pdfIn PDF document text
    • http://santa.sg/images/users/00000000/files/dasamap.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161474f5021d9d---demowawozawemiwem.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613568f65804f---52524553341.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/7901669095.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d6056853d---zozisofuzedewosagimi.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/pajarojabur.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40518676884.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8pk11qt99oo8p69b8bld5hbvk4/20023373790.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133a8827b0ba---67002534596.pdfIn PDF document text
    • http://sushi-belovo.ru/files/sediselosamititepid.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/88398822612.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/1602356941.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/21676396414.pdfIn PDF document text
    • 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_off0000d237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD237 10296 bytes
SHA-256: d2759edfb2fe196e456a94d0d6194f7f12b47c01286d5c626c5df38011fbb29d

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