Malicious PDF — malware analysis report

Static analysis result for SHA-256 edc6b9cf3e3bf6e3…

MALICIOUS

PDF

83.1 KB Created: 2021-08-18 08:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4d3bdab6e02dc5c011bc68146d0ac8df SHA-1: a14941a9b03de49389ca18da50268ec244e88064 SHA-256: edc6b9cf3e3bf6e31c516b80f20cfe478fc5d8fd142cfc94b6011a01fe52d627
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised WordPress sites, suggesting an attempt to lure users to malicious content or phishing pages. The PDF's structure and numerous links to potentially compromised domains strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d7cc3ce58---34326832776.pdf In PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/347218a2b67af88107e39664285ba7dd/vepefajep.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/begizelaganufufixikox.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/texitatotufanaxusinetiti.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607760c130c23---85644020016.pdfIn PDF document text
    • https://fuoriscena.eu/file/nikotezuweguxujanew.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e4af991d1---82033243577.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/0tj9sqr9vmcjojfpj5ie46bod6/6597260652.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c1f0559b9---53152117441.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/naromadutat.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160941eb2ea402---zujadakefosatileroko.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/safotipevubekukogatofax.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba52f63134d---kewaratekuvad.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/73546437142.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/s4p3v7spe6sr2qnj85tu16v2o6/taxufefadudunokadeta.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/daweridivijolonuxanesam.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/dipofonisujololif.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/55292813423.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad8dfc8a9a---sobupetezakol.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/86783388963.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/buvunuzida.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/57365462298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=exercicios+sobre+pronomes+possessivos+em+inglesPDF 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_off0000dd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1D 10748 bytes
SHA-256: e5b11c22067e61d2b2959884aee0acd852a4f295a52a8fea533d80d72b3e956c
font_01_sfnt_off0000f59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAE 18788 bytes
SHA-256: 4997a055f55f21da9c9960c323983d8cd385a9790111f052140ff0eab58d9454

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