Malicious PDF — malware analysis report

Static analysis result for SHA-256 a30534eb34793b7b…

MALICIOUS

PDF

102.3 KB Created: 2021-09-06 02:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6dc04e79358bd899d5e4b83e2c0c86e1 SHA-1: 7e1f78171559a5a7fbdf5f395b474b651ee7c49b SHA-256: a30534eb34793b7b2ceac37b82ef1488604ddaf9d96551bd73cb5b594edb5093
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting domains. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://zlato-eu.cz/upload/files/12099407456.pdf In PDF document text
    • http://dientrotiendathc.com/media/ftp/file/34412063774.pdfIn PDF document text
    • http://hopkinshigh1961.com/clients/878968/File/zoforalanifi.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/d5cc9c361c141805940c614c9a0bf333/tikugusobef.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/daal7udu83l3d0d5pvvs60331p/jojulowasebofe.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///202108293494_309753048.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/94198568899.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160995b47260ff---tabaxazawosovitaw.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610e662166df4---11153323217.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/jilaxikezuxewenikeloso.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/mukisemuvewumakerevog.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/14c2390ab47387d6bdabf8f2bba6f0eb/26473527887.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/21132352723.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51a1f5a6e4---73358845946.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/15453481345.pdfIn PDF document text
    • http://teifsepahan.com/files/file/pesukovefaweziporupiki.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/65310453648.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/65391846246.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c209497a161---bosakopepabevavezekel.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/vajuxeron.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/bomilufoguw.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c191321176e---wirosejewu.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/314ddfb25b609f2c68d4c033a9bfaa44/todusodigojig.pdfIn PDF document text
    • http://getem.plfiles/file/41213196803.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=estetica+filosofico+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_off000129fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FA 10392 bytes
SHA-256: 7778519f898c128ac2cf62143094cba70dad3df50256bd2827ce3ed5f90108ab
font_01_sfnt_off0001419d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1419D 19096 bytes
SHA-256: b525d1b0654e32ad447726a802ac30335775c6160f51f3bb1782fae944fa251e
font_02_sfnt_off000173dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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