Malicious PDF — malware analysis report

Static analysis result for SHA-256 b521f2fd28f199ca…

MALICIOUS

PDF

82.0 KB Created: 2021-09-07 15:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 331a0acb0b100e737c2d6699aed5dc57 SHA-1: f4d398167c17ec73ffd1924f9288b9c923782ccc SHA-256: b521f2fd28f199ca76eea560032da2bbbadca4aa22420f78ad2b2261af2bae21
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to potentially compromised websites and disposable hosting. The primary attack pattern involves luring users to click these links, likely leading to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://hulstcustoms.ru/uploads/files/4592334028.pdf In PDF document text
    • http://togclick.com/media/userFckfiles/file/79539307016.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/10e466544e8a565367f0c03d8eb2e77b/ribuloti.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160acd4e187b17---vutinagowarora.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/4276012028f164b0160f0e3afbd8a1e4/9321627180.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/lanisigos.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/40383902118.pdfIn PDF document text
    • https://evboosters.com/wp-content/plugins/super-forms/uploads/php/files/07e823d1c8a81cdc189b8839f956d64f/34749637959.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081904a311a6---85403537399.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a02d34e727---losetageviwub.pdfIn PDF document text
    • http://dejede.com/userfiles/file/73305088757.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/d4f53cefc8a81be2eef98b7a3eccd1fa/wudexevogeseruv.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/32420593832.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/nesoboselivolenekanim.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/23904613022.pdfIn PDF document text
    • http://stisk.com/file/17449650028.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/67162304204.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d59ce44419f---56935845915.pdfIn PDF document text
    • http://camonetinternational.com/files/file/83140095112.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/sovogi.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ae6819477846820c15a0a0a615c76fcb/wasur.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/botutere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=lipoescultura+tumescente+pdfPDF link annotation
    • 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_off0000dad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E5 18112 bytes
SHA-256: 7fefc1eb835029334f0ae969d3b7619998126cd7901410de7ad391d8547ec824
font_02_sfnt_off00012154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12154 10840 bytes
SHA-256: f98e5c53ab52eb19996a0783548f99e3cfde42ca2ad9645a11e395c70018da5a

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