Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd80f6a5c0050e05…

MALICIOUS

PDF

77.5 KB Created: 2021-09-07 05:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8137988addd46000ef704b345a812ad2 SHA-1: 792181d858c491cf7e254fee9ad7125bef32fc96 SHA-256: bd80f6a5c0050e05b321339c264c0d21d8aa5dd3eb6c1ae5bf52f0928ad8bbf3
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a link farm with numerous URLs hosted on potentially compromised or disposable domains, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to this behavior, suggesting the document's primary purpose is to redirect users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.rougeindigo.com/ckfinder/userfiles/files/tidupimuz.pdf In PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0c7678f4c---pelavipo.pdfIn PDF document text
    • http://mebco.ru/images/file/natanom.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/85662197115.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/kekugewizowozolawofurikaj.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1630197915.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/bb14fc7a3cee5845f914e9e6ac1f0d91/84531221269.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/ko3cdchc6m38e3h1s5crc6974q/retevitisoduwidigudep.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160982020ec379---72587246911.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/54855649918.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/dologifixusuzaxakiwevewe.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/a446e397762c88fe1f8d38e93dac2f96/telikimizupugigu.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/sidaboxeruvafog.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/fudakubamubegumewopobaken.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/74945a6961008811f73346f0afbb9bf4/judarubumexajiweraxufuloz.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609c82dd730e5---womowuvatezebenavelad.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/h522c095gqa4bot165lii1muv5/71889627022.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/jumukuli.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/69407934131.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c73399b52c3---vevamoguxegesi.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/fatiripexadakul.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b74f51577---81870428041.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/eb22aacd9046d5132f7b2494c35f02c5/55503051445.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/xugojafifas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=osi+model+pdf+notesPDF 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_off0000ce3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE655 10424 bytes
SHA-256: fdc263bb97603703cd94d738439980d188761033f133a995faa42f8d6cf676b4
font_02_sfnt_off0000fde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE2 16636 bytes
SHA-256: b20cccaf33c81772f04e2aefb6bb1a418b27a705e63d8e9150cadbf331072a64

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