Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6dede6824ecccba…

MALICIOUS

PDF

86.8 KB Created: 2021-09-02 13:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 82c460557a3db6ad63b47288614408e8 SHA-1: 3e8a4bdba043fab6d483606cdb5e38e334ddef2e SHA-256: e6dede6824ecccba9ff2b052325f076c4111cc0f68920883e6f3b2161204d66e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host a large number of links, potentially to spread malicious content or engage in SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=business+letter+writing+pdf+download PDF link annotation
    • http://www.nagsa.es/ckfinder/userfiles/files/54298531876.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/e41817eae708ff83ee15db8835e6b191/diwus.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/83842246185.pdfIn PDF document text
    • https://airbays.com/userfiles/file/gofibabeninubiferuzada.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/tadijeto.pdfIn PDF document text
    • http://etre-belle.su/images/file/mujakifuxaziruvepulemoba.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/2820488849.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/xozorid.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/nosugifenuvanebenan.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/2021713225539.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096374849b8c---zaniga.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/b93e73103f739b5942c45388cacec752/31482820474.pdfIn PDF document text
    • http://coinmarketsuite.com/ckfinder/userfiles/files/13805789001.pdfIn PDF document text
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/paxuwinevamifusu.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/1238baefcf7acb82a262eeb564426715/51968625763.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/bufipupafojekivovafuza.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/80733236129.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/62149552710.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/45231810850.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94469132116.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/oiumd9j199cniv91045mi9o55n/xejeb.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/boxepezirogato.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/fiboxozemezugusafiw.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_off0000edd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD3 18152 bytes
SHA-256: 0a45342e2bc29159a6d549bd15dd9577a253aad822506155e615c2ba5b7d8f42
font_01_sfnt_off00011c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13493 10912 bytes
SHA-256: 11098087faa3b151fbf5ac60ec560d9d280a3b603fd300bc51efb6ab91ff8250

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