Malicious PDF — malware analysis report

Static analysis result for SHA-256 17279d8df65ba058…

MALICIOUS

PDF

77.3 KB Created: 2021-09-02 01:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9fd54146a46e544f8468e425318b14c1 SHA-1: 309d7a4aaddadb7d3e93d6e1a815469b80e7a6a1 SHA-256: 17279d8df65ba0585583a37262e9519094263af2ac91ce6d2abe7ed8d2f99449
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=overactive+sweat+glands+hands+and+feet PDF link annotation
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/6f2e2c8c129e0f09aff6a558571a3094/37619501345.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-7/file/17119108973.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/v0sm78pq7sqo3rbum6c5pku3h7/femukiso.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2f6dcba8936bb4d5492d11a9a49c6354/20021817873.pdfIn PDF document text
    • http://ontsgoi.shop/uploads/files/lumokigofugovi.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/6da9dc824c80e937f5f628ca1fcebc3d/forufasozazebedi.pdfIn PDF document text
    • http://flexicourse.cz/res/file/piguvov.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160739d146c457---77907602296.pdfIn PDF document text
    • https://focaccellini.it/file/lagoxerod.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a91bac161ad---funemewopatijoguketoditub.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210621/210621235425449140b82h3lf6lcml.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/5u5u6rmuo301gssqt3j8h72vf4/96880482166.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/20288332512.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/58884397292.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/57963088032.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a8d9f20988---kuloperizevigunozodetu.pdfIn PDF document text
    • https://reniuved.it/file/68349891064.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/2f39a725ab7dbb67ca859dc83298acff/19843243279.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b6803a8ecb---lugewololexital.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/94286700381.pdfIn PDF document text
    • http://etnorom.hu/pictures/piserotupexeporipe.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/4698140042.pdfIn PDF document text
    • http://farmina.ru/uploads/files/77786163761.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16082f31f7d585---regopopiwewu.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_off0000c971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC971 17464 bytes
SHA-256: bfb836265a525ff3d16bd3d709e5a50cdc2d560fd9b274503fd99226919dc76f
font_01_sfnt_off0000f69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB5 10812 bytes
SHA-256: a9e7a1eee01ea8279320b3575c75971e459be9e09f3d699e173061c9a586f679

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