Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0566f40d0fa4afa…

MALICIOUS

PDF

81.5 KB Created: 2021-09-05 20:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 0d6551ba1ecafe12c133f98b4c1827c4 SHA-1: 8ab456dca65a5396d97fb6207ba536b34c0d5947 SHA-256: d0566f40d0fa4afa12e9de7a843255d08e24a14cb103540781467aeb707968dc
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern involves luring users with deceptive file names and redirecting them through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://thienlongadv.com/upload/files/tajizijonizadabudusaran.pdf In PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a7944f6db3b---nijibetowupurivijezeli.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c7a6b9176---56634322883.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/71695641624.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c8f8bf745---gevaf.pdfIn PDF document text
    • https://arerp.kr/data/file///54206925969.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/35858370884.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/oopg61h7vvmgddbrdgouu1bc7t/56849727882.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021060512015091.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/511077087c0bd1c5d3885c7871512cf1/guvaxizez.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/sumefu.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/geguwafuma.pdfIn PDF document text
    • https://raptiherbal.com/ckfinder/userfiles/files/tabodorejuzemajaf.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/rinexagoduneduxajonezisi.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/4339743312.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb4e0be66a---gasuduziguriraxeladumil.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/f1a98c7fa24fba87d0a769010227ab3c/favetuvepaburovu.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080457bbcced---76760974007.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/8dbce0d4db39c8a007c85dd88a54ab01/69182469857.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608923812aa1e---zewiv.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613237ee4e074---44553950150.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/fudegej.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/59913003315.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/josudafetego.pdfIn PDF document text
    • http://airfa.it/userfiles/file/vitetukomajufatitujim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=travel+guide+los+angeles+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_off0000da3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF253 10704 bytes
SHA-256: 407f7463651ee2db93e9720ee9310dd95c38121bc3a3d96fc98575e3b5b92d5e
font_02_sfnt_off00010abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABC 17500 bytes
SHA-256: 6954fbfd43576ddc4dfcf665a7f7567a82ccd06b8ea1861b516255b479915457

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