Malicious PDF — malware analysis report

Static analysis result for SHA-256 5460dcbd63ea533a…

MALICIOUS

PDF

88.9 KB Created: 2021-09-01 08:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d1bdcdb7846d19227131953441b72d3a SHA-1: bb78a8ec3d522893950108ee1164bedf8f3dea47 SHA-256: 5460dcbd63ea533ae341660351242aaadf6a9d8c74e71185f02b2d332360c912
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of external links, many of which point to compromised WordPress sites, suggesting a phishing or redirection scheme. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16083263a02e9f---38576647091.pdf In PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/9ae6edc7ed8682f1a8cb34479315fd51/moketi.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/tisuluguragaxilepomi.pdfIn PDF document text
    • http://amdind.com/userfiles/file/gufojewuzozetewep.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a97e2738813---34223056699.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/13079394340.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/tozuletum.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/vataluw.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/31888912984.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/fazotetesu.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160846a3c25ba5---71668430850.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/87601637962.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/3902841107.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/9030402660.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/1c5d676d671b7502f3be8094d7fb2385/gotimogi.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/44916388906.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210730_7B079B03FA2FC16C.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/mixofaripagefetitawuno.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/6508d2288bb0838205ce16dff4d50b62/50711141476.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/wowadenowozuma.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/pagojum.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cecc92bf5---miwixipupikarimofunazenok.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160780c02cf5ae---18533401149.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/891b0a38d6a90fe0a648cc200c510403/gitexifakavebano.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/99741092658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=contrast+stretching+in+image+processingPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF576 17960 bytes
SHA-256: 3012ae8a87f092bec81490bff5af4e2af946afdb823f49611e7b61dc345b8bad
font_01_sfnt_off00012483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12483 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C9A 10808 bytes
SHA-256: 48cfe546449f8087dccd9be557d9fe23d0ec5538a07a64f005bbc7ad9b761f43

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