Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb82a755c7e2d964…

MALICIOUS

PDF

97.7 KB Created: 2021-07-29 15:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1650024a6fcab94f5275b725b836196b SHA-1: faa9818fe33f000f777d282f6e17988dd7f07489 SHA-256: cb82a755c7e2d964871d144d470c222b009da80a017ee625237df28e96a146c6
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links pointing to websites hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection further confirms its malicious nature, identifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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
  • 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://crewmak.ru/uplcv?utm_term=fairy+tail+vs+one+piece+vs+naruto+vs+bleach+dota+map PDF link annotation
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/rsa9nh3dop5eb5km58mju2qoi7/34080786760.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f019e1272---93383150952.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d90c7a3b6---1329525775.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/18333400343.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/18767541930.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f149e3225a0---64363993671.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160bbc167669ca---muxejo.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021070418283173499.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/bufipupafojekivovafuza.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/e9c5ce760396946e5e1c2603bd895d3b/wulifidabikibara.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/3i3resdoc602eefjtq0t2vknvp/19997694701.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kawotefowuwolas.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/a570b347e9b1658cca6a8c8ba8a5b8ef/lisemulotibolimexa.pdfIn PDF document text
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/34460884674.pdfIn PDF document text
    • http://effekt-film.de/files/file/46938326879.pdfIn PDF document text
    • http://planetamama.ru/files/file/49433895872.pdfIn PDF document text
    • http://beateromer.com/bilder/file/tuliripuzi.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/bbq4n5g4jlho03f49v1ot3vj8a/26937333557.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/07ff88d86af4ee01bab8c51f4db6235b/45454793699.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/73614084611.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb97604607e---subepabimafarixipodagu.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96E 16428 bytes
SHA-256: 87a4b61754ede657caf61af3ccca2f623723835fdc4434d63fcde59c4d80d0e1
font_02_sfnt_off0001102f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102F 11176 bytes
SHA-256: 24ff6a314ac3e87ef3a41bb10b4ee282314262f73e2bed6383e3969bcbe130b7
font_03_sfnt_off000129dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DC 2360 bytes
SHA-256: b3dc4a7d05a70c77219be6ffb2d23d3b9b3c8991338c30b84936c46957d34927
font_04_sfnt_off00013456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13456 27940 bytes
SHA-256: 40c6cd47442555fa588152a3c136b081c58497a1da85823eeb16363ef7a18a34

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