Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc96b6640e5a94c8…

MALICIOUS

PDF

88.0 KB Created: 2021-09-07 22:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 576486965dc1773e3b64f3dd0eb25be5 SHA-1: 6872a1b0b2576963f4ff46b1b0148fc2b926c29c SHA-256: cc96b6640e5a94c8e275e6e2110e620ed5f0dfef6dd310ce15fb722c5adc7910
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. Heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://rauvuonsach.net/images/uploads/files/25430685343.pdf In PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/bdb9ef73e9f6af2c9cfdd99605477f87/62458204712.pdfIn PDF document text
    • http://m2m2design.com/userfiles/24807259457.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/diwiwevowalid.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/67362267089.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/6pvut60ipdhsd8e8rbmja41ic0/11045355155.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/161213b43b4a65---puvutolefuzewutakebuz.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/xolirijimutas.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160dee5cbcad61---kokuvuvito.pdfIn PDF document text
    • http://bereanbaptistashton.com/clients/1/1c/1ca8668e480cca1e897b6add33210fc6/File/72489523929.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/22995279942.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607979afd4ec5---mupabavogamofekub.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/84325frek3lf0g03t7f542tgm2/35117867156.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/10b5ec3586ce1a5eec4652fd3135d3d3/44826401824.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16079c340761d9---mamagulanirunemusurig.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/64488910575.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/poresakumataziji.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bbdf70398---57948260788.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/20888542674.pdfIn PDF document text
    • http://bluetact.com/locktactyuma/userfiles/file/basidameliwowarel.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/rolodesezijo.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160749394e2acc---4452280409.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/9f2b25c09b5bc726ddc5e56b3add0f38/wakilukasuxatorewumon.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/garotudarazor.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///77998898512.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bf38724de---73994255620.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=historias+cortas+para+adolescentes+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_off0000f067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF067 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10879 19428 bytes
SHA-256: c001a4c6b226c4df2ce75a4a9c2d128207b6437d43a99b9d6918fc27debf83cc
font_02_sfnt_off00013993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13993 10604 bytes
SHA-256: 19fbf9884fee2e16b2914bbe88e6fc873fc2155858c66f4248e17e41c58207e3