Malicious PDF — malware analysis report

Static analysis result for SHA-256 321acbe2b4b4e034…

MALICIOUS

PDF

68.8 KB Created: 2021-09-29 09:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ff0e1a0572eb601f9f46d83958b2f576 SHA-1: 29b2fbe5038b8b05833f6591b7dad2363fd51cee SHA-256: 321acbe2b4b4e034a352063a792cf55b712698f6b1a9fb4b27841a7d63bc0204
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected by ClamAV as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute further malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing lures designed to trick users into downloading malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3fee5f5f8---bibirovufikitokeladamagi.pdf In PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/n1h467cfhf7cn0l8cg9pscbl6s/zobapebowonutovoxitotajig.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/pizapuwe.pdfIn PDF document text
    • http://qdjshg.com/files/file/bevedujujiguruwoxejesi.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/midupowerobaz.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613df398bf50b---vaturafabumakewerivi.pdfIn PDF document text
    • https://12shio4.com/contents/files/bironusas.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/wurepitaf.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/55631582356.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/bepulomot.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/xivegifobaragivata.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ef4311c2e---fanef.pdfIn PDF document text
    • http://hzqzg.com/d/files/6951733145.pdfIn PDF document text
    • https://rozynoklinika.lt/userfiles/file/tutewigalo.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/9874551529.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/40339487754.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/82652953816.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/46648332668.pdfIn PDF document text
    • http://ver9ctrl.sonikgps.com/ckfinder/userfiles/files/99281267517.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/lilesot.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/21855754012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=does+iphone+6+have+qr+code+scannerPDF 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_off0000ad1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC533 10848 bytes
SHA-256: a22e0fc775aad755d337a48daa0ce3e0113a182570e685531d075752d61d1fb7
font_02_sfnt_off0000ddfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFC 15768 bytes
SHA-256: be6717a17a1c9b22195cc31334fdd52daf64b714b493e1a2915d566f826a0f25

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