Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51ed26cdffae04d…

MALICIOUS

PDF

70.0 KB Created: 2021-09-02 20:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 114052b8fac3061ca225d78fcc71895d SHA-1: 7ced701812746daa1b3dda65542c644a21e28768 SHA-256: c51ed26cdffae04de3bd8c2ef5db70d29e17c9134b5f9950ec357dcfd067915b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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=design+sprint+pdf PDF link annotation
    • http://nessium.fr/userfiles/file/53978241942.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c972cb21e8---lurusilusokigo.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608929ee44bb1---gulatuvejagegogola.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/12253589059.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/mowuzig.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f80333a4b69---31565970778.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/20528370206.pdfIn PDF document text
    • http://parentini.it/userfiles/files/60596951240.pdfIn PDF document text
    • http://hidramaco.com/files/files/jatif.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/85127461105.pdfIn PDF document text
    • https://kham.vn/userfiles/file/tixefulobufoledilu.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/74585752994.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3e5b47357---19533787669.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/64883982041.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/82549821093.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/3anc767or4nmm7abhcjv5mba65/beduwigasiv.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c559eca537---rexiwazivosujavaf.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/872b626ae10d8bb2e0956286ebb213cd/fidoduxo.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/xesesatijinafusutuwokikax.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/9u57omvhdmh5ngsig4hvpfph3p/17430383325.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/xosepasux.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/j21hrjqle3jtu6k02adrcjk10r/99231202183.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_off0000b52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB52C 15080 bytes
SHA-256: 9f2214a89c8f47c8311c4b336a36c35b2f8666fe0c0b2801e03dcea98cac3f11
font_01_sfnt_off0000db3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3F 10344 bytes
SHA-256: 443a6358507fb34d58f377b1bd27ca1942c460083443796f044657440201138b
font_02_sfnt_off0000f28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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