Malicious PDF — malware analysis report

Static analysis result for SHA-256 6959b2fdfb4f9f20…

MALICIOUS

PDF

85.4 KB Created: 2021-07-08 01:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 117eba70c8f93db6dc88d1ca82a7e574 SHA-1: 580ef5564ea58b0594c525373e4fabe4bb3cf6cb SHA-256: 6959b2fdfb4f9f20392a4bb6cf6caf36a83e06ab4d309ca602a004baf7b56767
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised CMS upload storage locations, indicating an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The document body was unreadable, but the heuristics and numerous extracted URLs confirm a malicious link farm pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://kassa.pl/userfiles/file/binidadufezaxixarevopeni.pdf In PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/aj6trbnd0lq5dupf8j47qa6d6f/gexokejumurijepe.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/vuvujoxevule.pdfIn PDF document text
    • http://dd-eng.com/files/files/zifibimut.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608447272f02d---jijeku.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbde054ff2---matugovegosarozefi.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/mgsau5q31ac4mi4ophqor77oj6/bagaj.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/c671c16645b2d0b2fc01295e1f79f344/31927960833.pdfIn PDF document text
    • http://lhsclassof1971.com/clients/74120/File/70697389313.pdfIn PDF document text
    • https://anup.bo/images/files/bozilesibonenanebewe.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/pubosoraxulurebunitu.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/52976182134.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/e9246502195a1f4fcb90cd4e24fadc59/37637796085.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160842e659171e---vatinunelavivixinejapiteb.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/reninigekebirugan.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/korimamegenari.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160949b4da5da3---jimegulow.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608697cb76cc6---zakagedifikewinowaxawa.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/55860041364.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/42785394852.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/qhmf2eajb2ig8onohqaku01ihu/48062233420.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1624406479.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607eae5571967---viretopinibetu.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082567dca5ce---taxeduxajenewudopabivet.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d859b3b576e---70571559478.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cae30a0836c---susarinujezebip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=accessible+physics+for+a+level+pdfPDF 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_off0000e8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AE 17696 bytes
SHA-256: bb8ba74947cebe7b84bff3e5bd63539e23c62fdc7b1f26e027c376a7b49afad2
font_01_sfnt_off0001174c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F63 10816 bytes
SHA-256: ec37d8da46fa3eb8955523d32afef1373f955294c3aad7ba819c68d15d4fd3b4

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