Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6bf614c321efd63…

MALICIOUS

PDF

75.3 KB Created: 2021-09-01 06:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 67112aba3e7917d30b544dbd5d49ba3c SHA-1: 530d8f431149fb1c6c7b5f8cc19d44e243aa3845 SHA-256: d6bf614c321efd63d33f2e3f3fd89bc1c3ad0c9d88490534fb355f094f4b613a
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories, suggesting an attempt to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/rerudak.pdf In PDF document text
    • https://geneticapanama.com/userfiles/file/vodanojisumokanobababesa.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/64995492748.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3448b4b9a---31001882493.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/2481397804.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/55716aa58b52c2301aad7032c330e817.pdfIn PDF document text
    • https://magerp.org/upload/files/poroxisijewonepi.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021080822365999.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/vifugemabolinotimovisugig.pdfIn PDF document text
    • http://insei.eu/userfiles/files/kanoxelorifiv.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/kovuruvifuguborerawer.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ce0a96208---6113618359.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/vipepisuka.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609804d4e1418---pekuwugobomonokawoxisu.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/dc3d0c5d8e0ef9272e373e3761d607a2/welejutazugusel.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/mixezitanuwusikadunotobi.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16091b0bdc14c8---sojefatal.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/favikobukenud.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/2f3abd3a3324d923a548854b0514c99d/65066274918.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a33550c2c7---jefor.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/fivekewarofexoxizof.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/83789729154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=yorkie+puppies+for+sale+in+los+angeles+caPDF 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_off0000c266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC266 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7D 10732 bytes
SHA-256: 61b560c9c28d8991c319abcddd4fcb21e60b8da128e4cd5b972edcb07e59d1da
font_02_sfnt_off0000f342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF342 17712 bytes
SHA-256: ea53c5d47239fce5c3679ba9928b40e6672f441cf41bd11d5b150b7255695767

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