Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf976ac21df7fddc…

MALICIOUS

PDF

77.4 KB Created: 2021-06-28 02:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 65f64dfe117d2a782fc3b63e0d4c7381 SHA-1: 5b3b17b3b1a8aa8e9ae36b9cf7a778971cd78107 SHA-256: cf976ac21df7fddc9846a27713bdb225d42691fa5607835d58316f1148341610
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute further malicious content. The presence of external URIs and link farms indicates a phishing or social engineering attempt to trick users into downloading files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16091536f73319---penesuwovuvikud.pdf
    • http://jandebruijn.com/uploadimages/files/tepobaxiwofuxofopomaliga.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf37024b9a---96082219480.pdf
    • http://iltorg.ru/upload/file/57198828463.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3da4ab8881d56b613635823accbcf4e5/35394513599.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b534f32e3---fuwexugurufusedudixijek.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983f3f1e22f---gadomatemelu.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d5bcd96894f---10695618173.pdf
    • https://partnyor.az/userfiles/file/512628822.pdf
    • http://acecaalcoy.com/userfiles/file/17833335492.pdf
    • http://ackerviewguesthouse.com/userfiles/file/legupesu.pdf
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/pusim.pdf
    • http://omni-links.com/loxoregaridulojef.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/gks1n44sum0ujjo2g32bgeun0c/23840421149.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa213228d2---neditomu.pdf
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/69c73806f2d3353c0045626ab1d1d226/6874720013.pdf
    • http://hydrem.ru/images/file/pikinevofigopaserepagenam.pdf
    • https://istocdukkan.com/userfiles/files/diwoluridokewuramome.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/672089c644ef068ba3b882616ca4489e/penufe.pdf
    • https://supermagnum-bg.com/ckfinder/userfiles/files/52985367517.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/6d766e524bd71a3a525c88df6856417a/dobubiso.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a850420d4---2470232474.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160cebe33a74f2---59872402847.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=black+background+video+song+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca0d.bin
e38f99db9576b47b8a821b8849c1925e3450ff91e27346b583827c86330a3fa8
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0D 16540 bytes
font_01_sfnt_off0000f516.bin
d85771752ffceca416d4787dca771999571132a80a8174192224b13a6d6b46dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF516 10984 bytes
font_02_sfnt_off00010e95.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E95 16792 bytes