Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31bc1f5c661924b…

MALICIOUS

PDF

84.1 KB Created: 2021-09-07 04:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eb429e78fb509fd6f49040d0efd0223e SHA-1: 17f4cd0005d77a534b4c47dc6fd5585f16d26963 SHA-256: c31bc1f5c661924bde3a319dc13f9908b56e3e80a062f78e5b958f4959abb044
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The heuristics indicate the document functions as a link farm, directing users to compromised CMS uploads and SEO-poisoned domains. The presence of numerous unknown and potentially malicious URLs suggests an attempt to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://tourgardan.com/basefile/tourgardancom/files/82480310641.pdf In PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609034f0c0103---54407928107.pdfIn PDF document text
    • http://ipceurope.com/assets/file/komizezukubifemagoken.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/dubemapodoxiwo.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45326166060.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfee9d64be---gesifemose.pdfIn PDF document text
    • http://shepardfarm.com/clients/877021/File/zexuzugozaji.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/b46c131c1809573698b630701fd258df/dimevadejixinu.pdfIn PDF document text
    • http://canoeing.by/pics/files/27643018376.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/piruvigezafome.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077cc6fd6ca2---sexil.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/zopulumuzinek.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b86cc53de---17121410389.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/jegelaru.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jevonilasaf.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/95939678682.pdfIn PDF document text
    • https://arendic.cl/files/zozal.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c67c3c025ed---kaxubezokamukaneralij.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/48456206774.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/98813412995.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/93833175910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=inversor+de+frequencia+delta+vfd-e+manualPDF 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_off0000dd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD95 19536 bytes
SHA-256: a0d5860fc13758194921b5a73d080d89b0b9fdde3981be0c15f03cf937eb1ebc
font_01_sfnt_off00011156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001296d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296D 10936 bytes
SHA-256: 825fc5366329fbc3abe4f4ec829f123d5cef1b65afab600a7c1610b001f811d3

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