Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f8c4b381c1f0f13…

MALICIOUS

PDF

90.1 KB Created: 2021-08-08 18:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 162fb1d841a1f6121005d523f913da55 SHA-1: d12b3a4804357af83e0f7d491f8c57c32d254095 SHA-256: 6f8c4b381c1f0f13f2040fda3979776e4945add5aa5457bf4efed8aee069af7a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites and other disposable hosting domains. The embedded URLs are designed to lure victims to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cructi.ru/uplcv?utm_term=how+to+start+cico+diet PDF link annotation
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078cf0e14aa6---90638651151.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/gmteaadteg4jvustv2b32sd0a5/duvoxaruruxatozot.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/mugubirate.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/binijezujigegavaxo.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/290051051568.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/xixaxexoxaxoxapofij.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/rawenobozut.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/lenovedosotanuripa.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/10615715947.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160d285719c3f3---mifax.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/vikuponipobulawisa.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/99965083862.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/7ki65b0g0vcc33v6vrb319k638/fexetekepol.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b01f0f4d699---50117500910.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/togitajikilaxaruravenaj.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f166a4ade---65488573282.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/rajivuwizegetivedojesani.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/ulacncpak902tvcm59m5rjag9k/65991089436.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5ebb421e9---25550354920.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/zuwafupejanuvejuxalulege.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/26865921320.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/tubidebe.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://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_off000104bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCD 16996 bytes
SHA-256: 3be18aae62e4df9ae8746b2295504b3fcb98db0bc117c9bc227adf20509b81df
font_02_sfnt_off000148dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148DD 10288 bytes
SHA-256: 3f491168a73fa571f7a650b03c53f2b7dbe0d98cb1e45c3c88657b0bfbc3f6ed