Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed366946ab5fe92…

MALICIOUS

PDF

82.4 KB Created: 2021-09-07 10:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: edc20858d2a7197f3ca0d5a9ad189caf SHA-1: d8445460e768d22f0adc0762065a6c781ec40c1a SHA-256: fed366946ab5fe924704a69c8a3275ce5c69fa9c5ad8a67e699ef51b89d46d77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on compromised CMS uploads, suggesting it's used to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution attack pattern, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23ebeed41b---saganadugimafa.pdf In PDF document text
    • http://studiotrusso.it/userfiles/files/66632827542.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/aff51f336f483a5b880f8a5264997a69/93582639800.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/58728f43205a2265c6209c194509bef9/xokisejolenafem.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/sesidibosid.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/91438563015.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ivtk5v1pl8n602kjd5404k8vc0/sazulajazemepik.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/kqahddnd2hr665gkh50rbu07d5/4806097558.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/rowuwaza.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/71791712311.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/91676387811.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/1frin81cisn3c8jk8pnvdvj2u4/wovukokodikevogelivama.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/dukexavukituzuze.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/9a4de0bcad753cbe9a5058fb596866fe/piwuv.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/lekeselurakiruvixada.pdfIn PDF document text
    • https://mimpiindah88.com/contents//files/28256054911.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/508449415.pdfIn PDF document text
    • http://standardamulet.com/files/files/gigilabupejekevejumumex.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607977278a48a---74170042222.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/16618644086.pdfIn PDF document text
    • http://cocoal.com/uploads/file/xetafotozikal.pdfIn PDF document text
    • http://rilta.net/userfiles/files/noxozotinamodilopipuxoz.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/48601494547.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/44097095765.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=manual+chevrolet+cruze+ltz+2015PDF 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_off0000d862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD862 19024 bytes
SHA-256: 6677c9a95e39c3de4f05a8e02375940631ff6521f24aeeb74ca4c10a8c395721
font_01_sfnt_off000109ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E5 10712 bytes
SHA-256: 1d7cfd5bf619b199253feab95ed5732fb530d968e832d6dd129b18df26ed5b40

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