Malicious PDF — malware analysis report

Static analysis result for SHA-256 106e1f30fb71c13a…

MALICIOUS

PDF

77.9 KB Created: 2021-09-03 09:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d5ba15a4cbc8a4977edcd5a0a3374ba SHA-1: c6f764ae692cc5a715f4732ab676e2052a4b45a4 SHA-256: 106e1f30fb71c13aae1c2b326a759bdf95249b56384c2c5877c447fed5ce38bb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/q07q02aou1ifsaf75oujm48tbi/56124157205.pdf In PDF document text
    • https://ubitanduk.com/contents//files/kotixa.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b4ae8d3cb---zilor.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/50149158167.pdfIn PDF document text
    • http://ozari-ua.com/files/file/firenitipubaxidume.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///74719190825.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7e6780669---dofuwelinevidovonazam.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/voliwixusozeza.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/dopujag.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad554043972---serugilenejokegokudexa.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/36401329234.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16098baf73d758---92622083815.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/2458908413.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/cdad3483c3bad3df267880afea10b463/52998029487.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/34470417502.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/c96fecd7756c188b9e2be266bf954615/71639197282.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb079cddf4---97139911589.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f18fa731c---26486181483.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16124e9ef554a6---74762589736.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/60613446572.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/pezamosofuf.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/jixosujutobuxezapimanob.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e323e1aac---mifidazeginu.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/ed9f301a690f6f3e465ffb161e05256a/kebopono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=tack+welding+procedure+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_off0000cd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD98 10772 bytes
SHA-256: 7df3b69096cbb47997da73b9d21568569778e3e7f489b367d1e0da8d1ca26709
font_01_sfnt_off0000e653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE653 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE65 17004 bytes
SHA-256: 8d07746085bc034d460f991fd3e03297401ff182f635837dec4c045c25248f65

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