Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f55908a9fe8872…

MALICIOUS

PDF

69.2 KB Created: 2021-09-29 14:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 678c8696d66c98b730afa29e5a88993c SHA-1: f9289ef7110dcf0d2d615e3422381cda9fbf2c5c SHA-256: c0f55908a9fe8872c990e6ef6ecce8c8ca77cbfef09aadb0fca055132d1d3af5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The heuristics indicate it's an image-based lure, likely a screenshot, designed to trick users into clicking embedded links. These links point to various compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/89e4f14d7f652bf53e86b2a1f7e842ea/polujuliweketam.pdf In PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614fc71ca8b29---rinuwibu.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/kulafalabaj.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/37748892823.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/wewagufedibi.pdfIn PDF document text
    • http://thegioicamdo.com/upload/files/39338961008.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/e185aff3fd520e0d94a82af2ee63a82a/63678615399.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/61577170557.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/23712306134.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/98dnsct5ov1k8gqikep1ojnkde/worifibaduwimoxevalat.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/bitosuwakiguwefakirila.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6efc96c67---zapaj.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/63979493863.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/datenigovajitubikezimarin.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/budimejovumimunuj.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/5054895406.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/tiruri.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/gukoradaj.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/8129898650.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/debovonenagewawofubexowul.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/61181059852.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/24880418922.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/jezadejexexefitudem.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/91185749623.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210925113010_1522136682.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=cs+go+hub+workshopPDF 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_off0000b2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F4 10344 bytes
SHA-256: b9a10bbb097add5bb0e15dca3ec8f9bb62301d2b3b70311fc84d36e2d932d5a3
font_01_sfnt_off0000ca45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA45 14368 bytes
SHA-256: 68d9d4d85c0b5c2002c51cb6effce7250e352dabed64564b61b52d392d6410b3
font_02_sfnt_off0000ed9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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