Malicious PDF — malware analysis report

Static analysis result for SHA-256 a817a8f2a3a6bcca…

MALICIOUS

PDF

97.3 KB Created: 2021-08-25 23:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f25c70b743342c8c0b7abcae5c4cf617 SHA-1: e116530f1ce826890a1f0110c50351e532b16472 SHA-256: a817a8f2a3a6bcca93f639ea8769d157c029ab188a06dbefe1a9b87cf1b88747
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720462d5f1c---salepitepugefude.pdf In PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e107d8b0f---91288801430.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/xinaxakovipegul.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a55330cde---99463264520.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021051805234173499.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/f9a3ae488a33f582e6d6538b0b96e7b6/79688597607.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/dglbuaqkkjnlecn6aj2eh93np8/didufatudosup.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160949df006ac4---lujotawotomovik.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/vawajigigozunoxijajoxumu.pdfIn PDF document text
    • https://33mobility.net/uploads/files/tefizoxoxo.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/lojoboberodugafidavemuwup.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/32348175420.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815bdc1451a---gemimitekedebotikitutenor.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fc493e3ec---26735164543.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/21285165173.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/bewuzilisimavesanoredi.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/59587414464.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/tvujfb0ij8vsrrn2nqghvjt0tf/pevoranojiwa.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecb1c6d332---95745787624.pdfIn PDF document text
    • https://argumentua.com/i/file/zuretukuz.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce8f0255a21---14255773375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=have+not+received+new+driver%27s+licensePDF 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_off00011933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11933 10540 bytes
SHA-256: 3db288c4729fda89c3dc8ebb2a09b4e9a75cf8f02232368ee16a8f315b6bcf50
font_01_sfnt_off00013162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13162 17348 bytes
SHA-256: d4d3eddd22354e4cba66da94b7362bf23b14345f19f868047a45883243f3c1f9
font_02_sfnt_off00015e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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