Malicious PDF — malware analysis report

Static analysis result for SHA-256 c263cf3c3feffca9…

MALICIOUS

PDF

106.9 KB Created: 2021-07-20 07:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7ea05f4ac1187056cdc8e8f0c5a96f7f SHA-1: a9ada2e8f26ed2b21417e7dd03bfd4ebe2171554 SHA-256: c263cf3c3feffca9d41d058231a5ad3b521e170234ba2fb3007b109b1a3cac74
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised infrastructure suggests an attempt to obscure the true destination or leverage existing vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f30f6a32e6---46477055644.pdf In PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/1tobe0iicug1oslvjhh855ovm0/90793959650.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/800bc14cdf6f593d4dc3470bf67adf03/18676373949.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984ae501ad5---mudomolevogujuxiniji.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210620/210620173833967338dy5xzk7raadw.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/17n5ttnujsvsv0r30iqf767l1t/11599191320.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/bewijexaxokakijapo.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/buvipovozuxuzelamafebemu.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/b26b4a85ef19c686857e69d9e12762d2/20634757688.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05971ca481---24748639312.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b5d85e17f4078df8311fe09d678a0b04/pinidiwazikunuzogovolekal.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/7b6dab19bc1e9fb1aa2baf2ddef1248e/fazofavakura.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16074b96587a58---24399405315.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/33866091191.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/41066812952.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a4d09bebe---7523445786.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/fb967dr3gpshdvgsg4rp9mefpv/26178475819.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/49743462830.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/wuwegurazanojodesofi.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/4130241273.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/vebimuje.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/lixevo.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091af6b9a36b---83511111766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=gwent+the+witcher+card+game+best+monster+deckPDF 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_off00013f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F12 17364 bytes
SHA-256: dc435676b92590e827f361b7aa57ba06b4e599a332c09fb05aa1d6e69aa0cf4a
font_01_sfnt_off00016c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18420 11128 bytes
SHA-256: 4db30671e356a1e5c3eec8bd2977ab0e32ec2637dd5356d825584fcd3d42a437

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