Malicious PDF — malware analysis report

Static analysis result for SHA-256 3946c7d873c96e72…

MALICIOUS

PDF

81.5 KB Created: 2021-06-30 07:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8bb6c1a91cf3f40bfc8055aebeef0460 SHA-1: b852e5b7c6395be22fbf947b6322241a00e13062 SHA-256: 3946c7d873c96e7274e926e965d0e722f2f892a7ad9b5c3019eac5eca4de8a67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDFs. This suggests a multi-stage distribution or phishing campaign. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware delivery via these linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/fd5a94d9863d47fc01acd9d8209ff59f/vawewepipolevibusiwela.pdf In PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/b63d832747005fc9e8f479817a57f60c/94811787246.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/sibixafebesewafote.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/156304999f5d252b81b2762d12c6caa4/panujaxobiren.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/55lh6b6k3mpoi0a8qctg8f1964/kidokazaf.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/kamifes.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/a06ec5d73f9c832b1df481e0399e644d/bapafezobigipumokes.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/2cltfhn65j13dtsbmidn5ei5en/79407679762.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9c0a50bea---nesaj.pdfIn PDF document text
    • http://katachizu.com/img/news/files/xitumokifereba.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a2e1837c5---dumalajilipexezikopar.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/419443524d5c33929ca56f11a2fae6b1/nagazimolodik.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160767dbc29aa1---fagaxigozatizakolugame.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4ba4e2f9c---36513127319.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/85980902496.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/1993890268.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/13a38550780b755f4cdc5c179936e219/kemofimedud.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/zekilodirarinopovolal.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711b6b5e168---69855699740.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ec089ec6e---50745923592.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b5ecc1494---davugezatozexubifaz.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/kilokora.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e43339a64---78741575343.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=need+for+speed+pc+torrent+downloadPDF 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_off0000d03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03D 10584 bytes
SHA-256: 6b522d686246a93ce98317a9b34dd0dfc051d74cee4149be6cfe1200a7aed251
font_01_sfnt_off0000e8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A2 22536 bytes
SHA-256: afa027d6e025065f6d887f56cbd219034a6dd1ab479dbe89cd4089e0d664635b
font_02_sfnt_off00011f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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