Malicious PDF — malware analysis report

Static analysis result for SHA-256 4924a91b0b242ccb…

MALICIOUS

PDF

71.3 KB Created: 2021-06-25 16:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ce285c7b96b492f801e12bc97e2fc11a SHA-1: c7430ca4ddbc6081cc8c90153c237bfccc42a316 SHA-256: 4924a91b0b242ccb2cb523273bc9fdd5be51eb5600ee92a2c8920d68160c1990
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to compromised WordPress sites for further exploitation. No scripts were extracted, limiting the analysis of specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://crewmak.ru/uplcv?utm_term=the+plough+and+harrow PDF link annotation
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/2fee41c6c5db6f7754264b4c351b4719/ruvewuvo.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce1ae3d95d---92576588357.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/6540d4bfc44cb459738d60a6019cb303/pidosudadifokevik.pdfIn PDF document text
    • http://teerosy.com/ipp/images/uploads/files/64264870630.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160854bf8a3426---poloxe.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf8e2ea351---larugejuvinutenugaf.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/rozaxipuvukijijefig.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/0095141c71f397543ef2090373e6da1b/88114777121.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/s02bhcfunctb0866lnro12epda/34863359358.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16079f7793d1e3---90431752976.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/71771927920.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/66902469671.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbd3a24739---9571054431.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/b6gl9mjoou65hscc96cfcbm7v2/27400621477.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/kjg4iuar1ic6o6p8n5804jeq3s/fimisofofapiga.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_off0000b634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB634 16208 bytes
SHA-256: 9e60e4e657bbc900fd0994ad9b681053dd0054109545a74da36e5e2255eb3cb5
font_01_sfnt_off0000dfe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE8 10460 bytes
SHA-256: 5e4ce983d563c92b3d7fa0ff335a01ca405e3f5fcb5c5def04b2b617b0fc0a8f
font_02_sfnt_off0000f76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1