Malicious PDF — malware analysis report

Static analysis result for SHA-256 21781ea40814f069…

MALICIOUS

PDF

75.8 KB Created: 2021-06-27 00:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec3937b41fb97d58a7b6707b8fc29310 SHA-1: 6bf1f70c9343ac4c68f210da07e302ce8877e931 SHA-256: 21781ea40814f06927c6133d36e11cd39fad08e2fe74ed4e7442b82fbc2b0a05
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to distribute malware or lead users to phishing sites. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://phannhan.vn/files/usersfiles/files/91871215639.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/4f3ea2d915223eeb8fd99c402be8e70d/bazalufoluzozepulidosoja.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/59253744a0640788d869cfccb69503c9/fetukusin.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7bc999485---56678917772.pdf
    • http://naturalmis.com/userfiles/file/dikerujajufiwutixufavopi.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089f0c7d4546---fafabeperanotozinutupag.pdf
    • http://svazekobciorlice.cz/userfiles/file/sozowubulupasezorenegiri.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609659dae71b9---toseva.pdf
    • https://alnahamgroup.com/userfiles/file/zuranu.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070159d32c99---pubobapazamam.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e4f315f07---bosonejeresitomagexuror.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5c341cb671ed3d74b99c9f07c0924c21/67168739420.pdf
    • http://targhevaticane.it/userfiles/files/48536834115.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbd70364e6---zafivodireju.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085311305703---nonewopusidesazomik.pdf
    • https://mps-india.com/userfiles/files/42656274724.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a82f2a040d---nadidopalise.pdf
    • https://psystat.net/candyticket/uploads/page_images/files/60424473331.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c71d38cf1cc---lesuxipejebutomulaluz.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/1m4vnbksrbrtnlh7n4pj3fimuv/66564447926.pdf
    • http://assushop.com/userfiles/assushop.com/file/97166323911.pdf
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/7a2qsjdefkiq0425rf45mi7bk2/xupemimezopinopokepexel.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/svb2jv1vbksh7fiirmsmbjmq15/kuware.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=downhill+dominate+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c69d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC69D 16792 bytes
font_01_sfnt_off0000deaf.bin
0bd6d5196dc9478ef4f1ff4e5a46a59a6d4ecac283737a6a7b8ba275f26ed778		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAF 16960 bytes
font_02_sfnt_off00010acb.bin
e967487ff5da6621da075f90bdca0697932b8a68aa7ebdb1a3b36cfa404c2b99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACB 10432 bytes

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