Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ab0c1c3f8cdc93…

MALICIOUS

PDF

78.3 KB Created: 2021-09-14 15:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 765c6ffdb8f2e08e78baeacc0f2de80e SHA-1: cc3cd48b27a778cc8e02aa7e0386cecfec0d7bbb SHA-256: 87ab0c1c3f8cdc938913c5f06a93c74585ab6b0e5caa8c8e83f68d482d4a34a6
196 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a browser extension or update, a common social-engineering tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://huntic.ru/uplcv?utm_term=how+to+remove+duplicates+contacts+on+android PDF link annotation
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16138733a3ae0e---495333114.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/rapuwudojaruxoxaletem.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/penopujunezo.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210902064633.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109050000203869.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed027ed2fd---jufuriwusumibiv.pdfIn PDF document text
    • http://epmachine.ru/d/files/21056697043.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/guzisebepozulirijasurebuw.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/44405498232.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/pologobaz.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/ziruvivawinon.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/xuzimoxot.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/60550144557.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/nilobenunuxafarukuj.pdfIn PDF document text
    • http://risme.vn/files/petedasefomajolu.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f576629036---pufegirim.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/7ed3022731cdabb86345590b5e3682a5/64624290066.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/hjdrprimvdoac64e5361gegngh/4451864693.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/puvelubaxivudofijuz.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/paganoloroz.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/tulapi.pdfIn PDF document text
    • https://kimcert.org/E/file/55791858676.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_off0000cb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0F 10916 bytes
SHA-256: eab74686b7e81c24c2468831c92a4669cb779c3ac870919379e3c88938cbf0e8
font_01_sfnt_off0000e451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE451 18284 bytes
SHA-256: e502689479ebee2f458ada6db414527e483d442e6364ea60c2efe5f9a60f8145
font_02_sfnt_off000113d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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