Malicious PDF — malware analysis report

Static analysis result for SHA-256 c97701092b04cb83…

MALICIOUS

PDF

97.8 KB Created: 2021-08-16 10:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: e6cf8c0a5721d868ba0bcf63e2ff692e SHA-1: ba0ecef63e81b65f255cc47e3e13f5a4113e7e52 SHA-256: c97701092b04cb8373b2c604503f5ba1d0325872c4dff31c8765f5d797d6e0dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to obscure the true destination by using compromised or disposable hosting for the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://pixomot.ru/uplcv?utm_term=libro+de+jaser+completo+pdf+gratis PDF link annotation
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/5380c930f343ae7d64dd9cbd10504bd8/36211013746.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/62669286534.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161169b90ad159---gusefugenosoxeziraxipele.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce8c31f04fe---sobipura.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/73800171737.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/42444297728.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/bofel.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/k3f6nuvtmainhhkfjnc8p0omks/sazok.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/mvbted44atu223e2c9ffabck33/pudakuwidumexuk.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/59136628725.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/67793712399.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/23353623406.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075bfffd8d1e---rezasujametonukuralino.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/zobezovidelo.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/datamadaw.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/4c4abda4e0c32307fa06cd09141c18cc/77938552235.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/ksj9mg832sls01v7ass3uhtb3a/22208452781.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc3c448533---86621574155.pdfIn PDF document text
    • http://amandamaitland.com/images/file/51703495432.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d892ad9cc14---52734227527.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/5071b726f5ade131401c6bd1eeba5479/19661174509.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/jabezunagijaj.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/235231e73087152a71c2eb24ed322331/97583832437.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/lamufet.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/5d3893d24c90d0d6a9b64bc59e179d10/56188446926.pdfIn PDF document text
    • 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_off00011bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDF 11084 bytes
SHA-256: 3ba30372660d7e171b3ee35102026e1bc77454b2b81fc05114ef773ab1bd53ad
font_01_sfnt_off0001354f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1354F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D61 17936 bytes
SHA-256: c29423a55d8fd9373481337babf963c8ddf06362a9d94ec0bba38b56997973c4

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