Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dd19cc3379620f5…

MALICIOUS

PDF

90.3 KB Created: 2021-06-29 05:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 71dd7bace0d7e30e15d86206e21b479f SHA-1: 09bd96a1e48389113b4a7cedbcd6d0a8ee0ba230 SHA-256: 6dd19cc3379620f5ebadb5fcfb9e16c08803efab793baea75104f0dac37e03b4
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to potentially compromised WordPress sites, suggesting it's part of a link farm designed to distribute malicious content or phish users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

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/07cb111e2323d7dd1d82cd9612093ed7/powukupobesira.pdf In PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/dojuwugunag.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/kefufomizixokalidezoruvi.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/vebawefemazerezuke.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/mukegaterata.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/7pv08vc4fvj75ml3liudgc05e1/89437122953.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/31486322a411cd5ba3ce3cf2a105a4f0/lujoxigepo.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/aae5f5b074aa1d0818f9b5e18094ef62/70097751669.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074184a2af17---bopagiwufekulom.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6a91e0994---84237708411.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4885086cb0aae7774580f8df493d6c68/poravijopipufuko.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/fifokawuwozufozuwuwoje.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25b4dd9db0---19332597926.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/7597143796.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/12059210769.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/985154379651bce0840c02214044e844/madibilatagukuk.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a07199bc6f1---sukoxiwewigota.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/40949335924.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/a4743edcc2eb22e03b1ae24486de4e31/69942594165.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/43106549706.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/pobovudusitivexobet.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097c84d46c30---sisosokajozusipab.pdfIn PDF document text
    • http://dakmet.pl/upload/nevufixinawunokigaju.pdfIn PDF document text
    • https://bibliothequeanglaise.org/upload/files/wenixawimajamozelebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=ebook+campbell+bahasa+indonesiaPDF 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_off0000fab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB6 17988 bytes
SHA-256: 128d8c29182234105d6540ea95060058c6422863db8712d6b5f19774521d81b0
font_01_sfnt_off000129cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CC 10796 bytes
SHA-256: 9008e462e974fabe7a82bd4be40ed21a83bb56fa8b8a00beb1a2a2d0f9f17ba9
font_02_sfnt_off00014233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14233 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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