Malicious PDF — malware analysis report

Static analysis result for SHA-256 3963ffe1246b6809…

MALICIOUS

PDF

85.2 KB Created: 2021-07-26 07:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b7b8a86d46328f71b596ab3e1878b45c SHA-1: 8828a3833c092abc1ba68eda9466508bfd799d87 SHA-256: 3963ffe1246b68091d1e1ca263eaecae458225fcb18e79368ed79e65b401d96a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution scheme. The document's structure and embedded links indicate it is designed to redirect users to malicious content, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098bd5746db3---23487142651.pdf In PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/2rmuaedq0jp4dctpqoe3hl8h11/vafoxebagaketuxu.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d54c684b7---56038882157.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16096f496a25bd---fudexakafijalegaludup.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16218917328058.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160ae68557e801---nobegapit.pdfIn PDF document text
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/6202072309.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/ef9358bc822d61845d2f7c6f48141591/dinipivejolebaze.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/39915895139.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/totozewuxu.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/3d1868b49da1478d06eaeed3c0c36e28/xidon.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160705ea87fc6b---wugubobekev.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e0ed6819---32821343455.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe89fea579---furuzitovepemit.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c951faeaad9---67177531799.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/caa8b2bdef4d9ec88d38f8c2e7bc8591/xisomadowidas.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c482ce931f---wumejifoxujig.pdfPDF link annotation
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/92110883913.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/gf1duumfrafpef3rqm01mc3saj/tuwumadiw.pdfIn PDF document text
    • https://pixel.bg/img/file/33126227444.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/kopobedugukesuw.pdfIn PDF document text
    • http://silverleafspa.ca/clients/10619/File/muditizisorikufulasorilam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=conan+exiles+strategy+guide+bookPDF 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_off0000ea1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001022c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022C 16964 bytes
SHA-256: 7823b5d5b242b07f8da6dea91c7be712c7a40ee79375f9ac763521d2e06bba79
font_02_sfnt_off00012df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF3 11000 bytes
SHA-256: 25b141d71f2a0b5898f23b3ddce10b6c74f5e5ea2b69bbd34b236e31783deb0c