Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0439c724819996…

MALICIOUS

PDF

84.8 KB Created: 2021-06-27 15:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8c83e8ff41bde429ad7bbc8c59065d7e SHA-1: f11bd38a8f00474c13169826750a89ddb4b2951d SHA-256: dc0439c724819996747684a357f00ef59803c3859f79b2a4525e303540d60ace
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to websites hosted on compromised CMS platforms. The ClamAV detection and ML classifier flagging indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8131

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/54eb47208fb712054be3488686618906/33081040882.pdf In PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad8626fc57---bakibanawudupo.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/14661892633.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/laligevozilisu.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/55766961067.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/27640509489.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/9b278c1ee7676cc7ed42465699fef53e/15595147660.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1e7d7f1fc---kibad.pdfIn PDF document text
    • http://erex.hu/upload/file/53911882674.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e48a21a75e---gosur.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/642f94fb5a7c0ae1aa72104c8adec539/94644376811.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/fevevitinen.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/95936169522.pdfIn PDF document text
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/kunuvegalodajexiwamolan.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160871f6f0d887---55590842747.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/c73aca25720a7b0fcba3e0912424ea7c/84664063528.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/13681273fb0596fb04be607799071f30/salerelubegixiwibojumur.pdfIn PDF document text
    • http://allycatering.com/userfiles/vawetezusomuvok.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/ac69bb63c7324dcef50bbf7561538cdc/65338164517.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/e33f655030f94b8451ae43e1eac2d6ba/bexinipigapi.pdfIn PDF document text
    • http://axwelindia.com/uploads/99365407692.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=death+note+full+movie+tamil+dubbedPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ce12527cd2c57f50fe9a2be690d07e3c/mimodijatur.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED20 18456 bytes
SHA-256: daf7012fcbacb5381af004dada5d69a6d562286e80ce5badfdc21b6967dff6a5
font_01_sfnt_off00011d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13580 2064 bytes
SHA-256: 5221cc56e96b657ff7c15f49bf1fbf1b5222e15cd7ffd769ce953162a3e53832
font_03_sfnt_off00013ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC0 10656 bytes
SHA-256: 04113b52f9e73b11c37aa63337bfe9f785c296585ef60973e2bb3818ad1476f2