Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b2dcf92b5de5ef7…

MALICIOUS

PDF

63.5 KB Created: 2021-09-19 16:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4e5a2bb142f1997fc9302135ee565659 SHA-1: 3b89f5555bc51c569eb0697bf31ef4e97f1f2d84 SHA-256: 2b2dcf92b5de5ef7aa966e5d88ec671a4379afd7a57797b49f3741f8f78287b8
154 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are designed to redirect users, likely to phishing sites or for malware distribution. The presence of 'craft+pocket+edition+free' in one URL suggests a potential lure for a game, which is a common tactic in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9231

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://coretry.ru/uplcv?utm_term=craft+pocket+edition+free PDF link annotation
    • https://jiu-hang.com/upfiles/editor/files/pifunolenasid.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/lirupujesokiwosarepex.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/nekanozadab.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/f2dfd4f4cd8fb1358f7dac21754bbe2e/vesipumaxuluwip.pdfIn PDF document text
    • http://net-marketing.hu/images/files/63408149906.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/loginulubi.pdfIn PDF document text
    • http://tonghuichem.com/upload/files/78885465542.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/43525877241.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/fiwoxipowipe.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d95b63cb59---masutavasilaxapurokun.pdfIn PDF document text
    • https://raljob.com/userfiles/file/nonavetorek.pdfIn PDF document text
    • http://hydrem.ru/images/file/18885312357.pdfIn PDF document text
    • https://educhina.mn/editor/files/25422354680.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/tutababipikiguxujefuv.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/gobatananuxivixozanebave.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/rotigesokorok.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/5647481835.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161442f994fc81---tuduwozebijemezivafu.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/37811612494.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/zavule.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/52936396528.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/95120993699.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/19690109668.pdfIn PDF document text
    • http://maksimetall.ru/files/25153633840.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_off0000e2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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