Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8042d54ebdec940…

MALICIOUS

PDF

86.5 KB Created: 2021-07-31 01:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8e882221353729fac50695fb869733c9 SHA-1: 4c894c3ff35defe738e35ea8551e79c0accfc22a SHA-256: c8042d54ebdec940cd860884b090348302a5f58fd85cd8eba136bd3c2ff886bb
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://cructi.ru/uplcv?utm_term=can+you+use+any+vinyl+in+cricut+joy PDF link annotation
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/aa1580f96fd43d3e3d57d33812cc53b2/jesugobevavubelenaveja.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/6960872351.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/e88ff6beaab2fe3440945b6bdd28a13c/nagegokipesaxelobesakimu.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608423ca2fda9---37021912663.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/vaxirawazosub.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/puvofuzorubekomowuwere.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd1d581d32e---fawipavuwuxizebile.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089ce67357ac---mukunogoze.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/tabosevimeko.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/3529cf64941287bffb2bfba79479a155/mewisogopafometa.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/70431371046.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/b25c229809854e4cb069c2cc90df8d56/sefezumoferakigom.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/f92d9e484d3b72cf671dd4aca7d70182/tukabide.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/lojodugeravazikov.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16076f0684208c---96061352500.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac848540469---85303478623.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/26316265053.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/7284661797.pdfIn PDF document text
    • https://appfacile.it/file/savovutesu.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/55355411521.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eebc593478---8909389486.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/91671292494.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/zetoka.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E1 16920 bytes
SHA-256: 64de20dff9ef2485dbad8e6a16c37dd43d0f01b1c60f51655dccdf37607857b6
font_02_sfnt_off0001329c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329C 10664 bytes
SHA-256: 1b56ffcb1b35f2ed5eec0c737cbeab60994b40f587ac4e4ee407a92818211e6f