Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaca5b25ddc403c1…

MALICIOUS

PDF

72.6 KB Created: 2021-09-05 00:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b765c0f4336bc073bf1e373ba48b8443 SHA-1: 1067659c20a53d9f41b1c2c3f780ddbb2e6f1aff SHA-256: eaca5b25ddc403c1ddf274ece379c7ac0b8fe432c0287592e854fc0056540245
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these links for malicious purposes, likely phishing or malware distribution. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://andrejc.si/files/file/62728127028.pdf In PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/vabufipajibafarebomizigap.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/666031cc2550d808c6cf7048caa9ed7c/83930544153.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/napodupewodesifasiratiwer.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/3kc63j3r2oeifo3cmqbcv4mei3/93010057956.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16070c8d567b33---jazibesobiwokolepisuxes.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/si8nadimkpfrf05q7bv6ag1qr6/42244485513.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/72357124680.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/8b283750fce2a2ea8f8f979165e9a706/vajemobonerowevuwexilemad.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161077b746b91b---42945966308.pdfIn PDF document text
    • http://charivne.info/images/file/44625735044.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607146fdeb55f---fapesazixefomupixor.pdfIn PDF document text
    • http://mariangelesorrico.com/galeria/files/vilidevasexasodosiru.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/bomadif.pdfIn PDF document text
    • http://nature-revive.org/files/file/58160932318.pdfIn PDF document text
    • https://noddy.nu/images/file/95573879786.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/49478877006.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b27bf145b4f---zejabosutuvafirirud.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/duzinivageniwifirego.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715207e3056---10964849211.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/94849980731.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/8dc83745289c32edcc4214e62f1312f1/fuliloxojawud.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/39058439791.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/dijikaposamexos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=giving+instructions+worksheetsPDF 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_off0000b949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB949 10684 bytes
SHA-256: 5083973a0a1fb01e1f184ee24f5d7535872b1fc960ec3fcee5cb3d89c2e99bfd
font_01_sfnt_off0000d1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DE 16740 bytes
SHA-256: 7b9134e24b2d3ef77ee96fd2a72ab8204d4714852e810bb60933e8b76119a65f
font_02_sfnt_off0000fcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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