Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf1ab836cc63e02…

MALICIOUS

PDF

84.9 KB Created: 2021-06-29 18:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c861a638b03dd65b80dde3ca22cb1725 SHA-1: af03f03164aeb3dcc25d0fffe69f92aeba4aa67a SHA-256: 3cf1ab836cc63e02ec8e5a339d2cfe6aae4277b32f9c7c9d04a7657f2c8cbf1e
164 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure further supports the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://laborke.ru/uplcv?utm_term=mad+max+pc+game+torrent
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/767a329dcbd9a6ebad931965cece7e3f/23684659366.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e252bc1e---vokupijajoravib.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609cec01d0354---nimegerofujugaresipes.pdf
    • https://alihuata.com/userfiles/file/dusoweta.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/5vsq4bkdgibculh9230ui26096/zuxuwefedop.pdf
    • https://west-holding.com/userfiles/file/dafol.pdf
    • http://1-cx.com/ckfinder/userfiles/files/sefojefukogenidu.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/oobclk1742ur8garheojjh1r51/14840216375.pdf
    • http://web68s.com/upload/files/rebojerejufosimubeb.pdf
    • http://wirheiraten.de/images/file/xenuranufinuko.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607df82f913ad---45551375671.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c8580c6a333---morefegubekaxedura.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/eg69q85ietkuq73hbtjlfk93l8/gabewetu.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/51c022f8b15bfaae86ef32de8267237d/21523080366.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16099181204904---68179879757.pdf
    • http://sportgalaktik.sk/userfiles/file/logowowanir.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fec5aae5be---posuvopifumimilom.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18b0891a8f---mowejumeluxeka.pdf
    • http://daydreamspin.com/userfiles/file/xovanotonox.pdf
    • http://caf-ljubljana.si/docs/15264519248.pdf
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/firidiwutupivew.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8fbdbb4b8---sifakiliritu.pdf
    • 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_off0000e97d.bin
134f5ed5b5fe0298320f11c9d2e67ca95f7b279bd56642fc455d95a3a252f1bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xE97D 10644 bytes
font_01_sfnt_off0001019b.bin
84f4d825dc41060010e2714a691fa4574808dfd9369f4a73f6167004080d6dd4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1019B 17184 bytes
font_02_sfnt_off00012e82.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E82 16792 bytes