Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3d0333839f712b…

MALICIOUS

PDF

74.9 KB Created: 2021-09-06 16:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0bd8908c0de82693b5f893768af7a2d4 SHA-1: 1b56a66b832adb1e353f8c5b25e712488eae831a SHA-256: ff3d0333839f712ba29919ededf982dee6e0b7bbc1b2eefcf58fe0030619b98b
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/55221bb5831ed1020e5c8cacdfd62918/40353661119.pdf In PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160895de0455e9---11497272708.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/57445028419.pdfIn PDF document text
    • http://cortabellanews.com/userimages/29087526380.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/d874afe56facc622edd848b8a5cb8347/93816073101.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/nesadajituxisiwib.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/p2msi36mt1tqp74hj899kpcnon/pusegeto.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/95942675478.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607568d7b8571---puwenuvekomiwumubo.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/xitogedenefukeni.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/57040653920.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/b0m44k9f43j7m6vsrcmt2uhqpb/94880593285.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/1381296365.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/84442518604.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608d94efe6f54---betasi.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/00oo7l6j95sn0sm9jr214q33f6/zofadomekusek.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608904e0698d0---kisinipifupidimijivuxek.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/32100608845.pdfIn PDF document text
    • http://honda-vo.com/upload/file/juferuwumuresirevawab.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/nofed.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/54645654137.pdfIn PDF document text
    • http://kino-cosmic.ru/sadm_files/23322804616.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/18532443932.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16081315cdf41d---15961045173.pdfIn PDF document text
    • http://smiletoursvietnam.com/ckfinder/userfiles/files/ginokunuti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=contaminacion+ambiental+en+mexico+blanca+elena+jimenez+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_off0000bdba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D1 10976 bytes
SHA-256: b24b2703f16fe0a9a8ca5c1a48dc90bdbe2851265bc65b288c22a1c43d141fcd
font_02_sfnt_off0000ef1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1B 18328 bytes
SHA-256: 38afa6cad4f3d20cddc7adecddbca2777304d4bebd1fb4b550da5cba9d0422b3

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