Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b94a6c365f58c00…

MALICIOUS

PDF

115.5 KB Created: 2021-07-06 13:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f9cd3ecfa97ea951dd790c0f92b98635 SHA-1: f1496bd6fb9411f43c91a0e928e58d810316e5f8 SHA-256: 4b94a6c365f58c00b750686e562ab1f7836beb1a61996689b007ab1bc40f2f93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links pointing to compromised WordPress sites, suggesting a link farm for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest the document is designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://chcial.ru/uplcv?utm_term=pirate+flag+called PDF link annotation
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/rajbpopl9b2eea56ccvoa00r64/16378880511.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089a42279a60---87426100396.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/4ce51f75966dd0c78dffbeeef8b9bcb2/rujazatusibanotu.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/rqidler1ce65njc5lo6k7au5ks/ruzikuwufefu.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16076d7f6a9c2f---bivigobidiwodirexo.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/qvsorbuvjpf32fej6sssbhe641/xukitiwemebapefotani.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/91cbb6367910d688b964f0bc383ee827/5560868550.pdfIn PDF document text
    • https://proia.bg/userfiles/file/lulunupudaxamuber.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/53849028528.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/7849481035.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/3890693f5c9d86454a50156f646c1f92/94827695570.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/65688306271.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c859ee74fa7---jatitudesedetaseve.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/29798499725.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7f3bdaaef---nosatotisafimubifuzokol.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/06/29/viwuwakuduf.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd11264a14---92623768285.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/74d53ab77fc27fb662c85f1b0725c8d8/72065246297.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/a1b55a27d8fa06d5446d90f27137433c/28419165281.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6e69770f7---gugetikizumo.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/raxaze.pdfIn PDF document text
    • http://senn60reunion.com/clients/876260/File/83090914588.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a73b9430851---87125418108.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14958 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16169 17036 bytes
SHA-256: a0c77d14ca1f6956bed5fb1cae73a935ca1d948738dc61f0b6f9612ae193b6fe
font_02_sfnt_off00017a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A3C 19004 bytes
SHA-256: b8d2d3616b810969f557890816fb8c4bc69610dd132f3300c8af68b2e16dc45b
font_03_sfnt_off0001a9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9A5 10260 bytes
SHA-256: eb07e810a9dba2f2c40c5397ec66ffe7869d57c7d214b71e57b828c3bc3d6821

Open this report in the interactive analyzer, or submit your own file for analysis.