Malicious PDF — malware analysis report

Static analysis result for SHA-256 24473ed2a71d179b…

MALICIOUS

PDF

93.2 KB Created: 2021-08-15 08:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2caa4108e557281f8a9efb95cafcf5cb SHA-1: 8a4c08dc0059474affb987c3b67b1b5c84a8d739 SHA-256: 24473ed2a71d179b1850ba33f1a5d2a49dffb6cc94e418301b9b63ce6c1c96a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://joebalogh.ro/imagini_ws/runenujasusenuretifamife.pdf In PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e7809125e16---buretoxexodakupa.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/34961566664.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/vuzori.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ffb0adc3c---fitetizexulibul.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/55286807530.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16206387993621.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0eb8dbf39---xanevegobavenoregome.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/nijavul.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/69003272957.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210613093727.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/48652524021.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c561da67c---zokuvepo.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/71539847544.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608da66deaa4b---67695182987.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/76150e736b48e93e7d592e37a85cec51/44506134531.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161089aa6b441a---basudodijuzavudut.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608074b315972---fanenifu.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e774d03dc25---86652956070.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/75861078282.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/64545135595.pdfIn PDF document text
    • https://sanidom.pl/img/file/libara.pdfIn PDF document text
    • https://advik.net/userfiles/file/14837531606.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=what+was+the+result+of+the+invasion+of+manchuria+by+japanese+troops+in+the+1930sPDF 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_off00010330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10330 17464 bytes
SHA-256: d2db74895438b43f2df87947a48747bedce713c0765b91f97a04850388f58cc4
font_01_sfnt_off00013096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13096 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000148ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148AD 11888 bytes
SHA-256: 6c77a574ff88705464d6cc9094c5b18b500a0ffcf06a3ef48b3820b22980b3ee