Malicious PDF — malware analysis report

Static analysis result for SHA-256 c90b445dcacc52f3…

MALICIOUS

PDF

80.0 KB Created: 2021-09-07 09:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 95e18de7fe337f3754cef082db106b2c SHA-1: 22e1aeaeb5267cd33c2c765247ab2ec931ee1912 SHA-256: c90b445dcacc52f3aaf2f46661724d493b73d77e338db347ba83f06841b28452
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but reinforcing the malicious nature indicated by the heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bab8933128e---wurufuzenusosuwefoner.pdf In PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b9257746480---21988810031.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/xukoxesekel.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077088b9daa0---78636860169.pdfIn PDF document text
    • http://novichiha.ru/pic/file/91470836692.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/nevuwogi.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/ritowogameruzofukep.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/mpipm6qu39ce9f8o1ssbormkfp/38448129626.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160947b64c22f8---kapabujak.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160770c724d542---goxaratuwefibuviv.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/181693525.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbab610845---mepipovixarijedusuwagigil.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/68647900549.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/62224081060.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/98630604990.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/1981805469.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/demizegeguzogogamina.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/buniwuberi.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/22sgi865fh2paekafg0i4c5s08/mojetovumikijomoti.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/fbpj503tke0ollocqb84e8p05h/62577665548.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/59102530453.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/wumebogijodirijovafube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=nikon+coolpix+a100+manuale+italianoPDF 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_off0000caf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF1 21596 bytes
SHA-256: f964410ed97c8bb0a72ba03be195f8e5ed83c3d97bf106faac4d338c59833b6f
font_01_sfnt_off00010167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001197e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197E 10712 bytes
SHA-256: c9d7c37acbf24257348e1d4c86e776ab66c52c49811a252337c62bbddea87846

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