Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ed81df808dc4fcc…

MALICIOUS

PDF

75.2 KB Created: 2021-06-21 18:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3c4212348afb8ac60f83eb851e66e7d3 SHA-1: 18f6ea3b853693a430a832a8109fc630ac1ad667 SHA-256: 6ed81df808dc4fcc1791ec4889efdef7f0763125a1d92194ffd50ef66f0ccbe1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations. The presence of 'utm_term' parameters suggests a phishing or spam campaign. ClamAV detection and ML classification strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=split+6s+blackjack PDF link annotation
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/ead8e06e0db37672baa85824308e3c30/mafimejubotodujafe.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/4211cef62affa8dd84a59999c571a192/2098244290.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3d8a32738---60706645859.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/da7c4064ccde5b0336fd64a1ba051158/nuposelafasotuto.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/6addd4832e4c9fe0e03c62d9132fdc23/52372987404.pdfIn PDF document text
    • http://rsst77.ru/upload/files/suxatixaz.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/tukogufalokisanagotesab.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16096e1fc820f3---30131310184.pdfIn PDF document text
    • https://nadamasristorante.it/file/dixivekimev.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/59o202gdjggapctk0mnp8sodd5/78488223795.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/92972575122.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/5e90bda68abe2e531b9ddc120ad904ee/xawalumotumiladaxadizet.pdfIn PDF document text
    • http://614move.com/clients/4890/File/pizuxata.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/kenasowotejo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA60 5368 bytes
SHA-256: 11074cafc0661ee49ca29e164c06380d17beadb05cd78dc35bd6b04d5543fd96
font_01_sfnt_off0000fcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB4 10012 bytes
SHA-256: 6450e248983f4d469109de59f6986fd37b3fb26bfa9408283ebb947b998b02ed

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