Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8714deb1d41bd33…

MALICIOUS

PDF

60.9 KB Created: 2021-08-26 18:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bd70be1de737ff8447747392a73149ec SHA-1: 45a92073c5e29b3b4f935b6b8c7f0d008b736461 SHA-256: a8714deb1d41bd33efc84798b264dbed2ba03a192b53c29c9901dc3f74ddb3ba
154 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9511

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://weingut-suppan.at/files/woxaguwegenaguzuk.pdf In PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/uits34gf0vk71o03um0fb34g21/53531739973.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/dmkpr20v63uhjl32c4h567sh2e/pinefojadane.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/23108259355.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/c8f58f32a279893dcd4c17de598f6a13/bojuvijalo.pdfIn PDF document text
    • http://kbchina.de/upload/74186093170.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f569d24fc---71321625651.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bb3fc89e1---noxorawalafobatasot.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/lamofixegedorewapesofobep.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be70669225---kapunoxolefegib.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/36248593243.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/65301022045.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/12371506233.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a53c5f4320d---40262747035.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161131fd013bfa---kabadutozadunej.pdfIn PDF document text
    • http://lhjmfamily.com/clients/5/5d/5d8645f74963a96e1aea25f3b610eff6/File/goxogosi.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/5247818591.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/437fac6b6ba263216b85b9630fa64088/42563279184.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf96725571---kivalukibololawuz.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/fcab6cdbee188fd33b1b26138e59c365/kugetemewexobenuz.pdfIn PDF document text
    • http://beateromer.com/bilder/file/begokaxap.pdfIn PDF document text
    • http://chinazzjx.com/d/files/totokejojo.pdfIn PDF document text
    • https://peterdegendt.be/file/37859701764.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/a5cca61a6eacfa8742d852aa429b2dd0/febumekovidugox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=application+of+colligative+properties+in+daily+lifePDF 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_off0000ce21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE21 17004 bytes
SHA-256: f3944c6d4402f6c724df9ac1b9bb557b60d97df238bbbf8e4187687475cf5237