Malicious PDF — malware analysis report

Static analysis result for SHA-256 1744a304f305e265…

MALICIOUS

PDF

82.8 KB Created: 2021-09-08 12:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 40007d848dd061042451aaf1945cb351 SHA-1: 88c85bcd3a2f1deea084158e6f774c86b3e91f25 SHA-256: 1744a304f305e26592591e3d0240b06eda2d516a8783f80a783ba19150117f52
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised WordPress uploads and disposable hosting, strongly indicating a link farm designed to redirect users. The ML classifier and ClamAV detection confirm its malicious nature, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://infrive.ru/uplcv?utm_term=c+blues+scale+piano+pdf PDF link annotation
    • https://xn--49st2et51duvk.com/upload/files/sujes.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/13071076250.pdfIn PDF document text
    • https://mytopics.it/uploads/file/42409370023.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380cc9e2de7---lonogiwaseba.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/49046781260.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/98060768628.pdfIn PDF document text
    • http://saint-party.com/media/file/zuvupamunojekupatudovalim.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/69161625513.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/duzofuziwanewejumavot.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/fevanotozexalopamevememum.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/72527885636.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/xadujexifizomego.pdfIn PDF document text
    • http://szjg.hu/images/file/pididatibowezubapo.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/kitasamisurusadubof.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/sexisanasavutamowika.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/52511831137.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/77016907282.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/34944206030.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613025a027355---jesaxe.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/41451063414.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/dipamaxagiledobiri.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/d715fb9304df8066abf9c8840ef9f110/mizukofeji.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68F 18060 bytes
SHA-256: aa540f756d4b83d51ae349a5f02b5319b159ed027f4a3218347c2533bb74a17e
font_02_sfnt_off0001256b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256B 10688 bytes
SHA-256: c5f1a021c05b656bd03c3ecf00e2efd492611f3e81b2ec502d03b6b1ea27a28e