Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da5fdf39f23a42d…

MALICIOUS

PDF

138.3 KB Created: 2021-06-29 02:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06e926b3ec67cc39de8c27924d13bc17 SHA-1: 174cf6a92ef4882ec81b37d65c7cbea2beeb211e SHA-256: 3da5fdf39f23a42d8782bf8a3ed756f96f3c785013eb27a51be1593980cfe08d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL distribution are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=345+bus+timetable
    • http://dok-vo.ru/userfiles/file/dunemijome.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/u36rqpk5il50iljmilb1mv6uqb/13818237880.pdf
    • http://feast.to/upd_file/59096950526.pdf
    • http://jamessham.com/admin/usercontent/file/wozamoxizisijipixu.pdf
    • http://dichvutot99.com/webroot/img/files/67130676796.pdf
    • http://yves-segers.be/userfiles/files/jawewavagatap.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/22ibgsmaofqi9io6uq3j0pkth9/48050332813.pdf
    • http://dralituncer.net/userfiles/file/45132035119.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759396c61eb---79850122568.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/aj68en1gt7j9fvllgce7oi849s/2263947552.pdf
    • http://stalmont.eu/userfiles/file/29957178685.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076608507ca9---fikefemobisarutoxinower.pdf
    • http://samuiluxurytravel.com/Uploads/file/69798984630.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098839142708---timasasuv.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/lk6u9scsv2hrvrm7h05qe69nec/31145790498.pdf
    • http://akcjonariusz.com/UserFiles/file/susuziwonisamowura.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/bhtrufbhp9155c4dqr9r7csoa6/rujutesomukumemexevitopa.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160c86f82039d0---renidenewe.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_off0001c166.bin
ee5462a1271c73dfdd08c82dd433db6fb51ad70af763cbb69c4189a68e0f1152		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C166 16544 bytes
font_01_sfnt_off0001ec63.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC63 16792 bytes
font_02_sfnt_off0002047a.bin
acd7c49e212888ef45b1eeb325fe33edfa7c9a5e65adf94824fec6816534eaa8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2047A 10472 bytes

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