Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f17312a248942b…

MALICIOUS

PDF

82.9 KB Created: 2021-09-05 21:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: aa6f33b1c50179c6ad0a00f934a64b29 SHA-1: 68b0ae21420cf3201508b09fdba99405721e855d SHA-256: 66f17312a248942b227ceb6a6ceefdf83ca1f4661c0a9f0330404f171fb61688
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely responsible for executing the malicious payload or redirecting the user to the malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://bjerkelunden.org/content/files/userfiles/file///65962320561.pdf In PDF document text
    • https://tlproduct.com/userfiles/file/78981054919.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/47829018363.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/dejinafofosatej.pdfIn PDF document text
    • http://fxmeat.com/upload/file/1e3cf38cc4130c1ba22612924de95952.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/gaxekixafu.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/lezijuli.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/28247028236.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/67484624342.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/tugijejisapogugaluta.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a03dd5406ce---34388826247.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/10962258717.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/160778a565d3dc---siwanirinewo.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb60548c089---61531569371.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/reresuxuzuvup.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/51nngsin1d3mtbkelok7knsvcb/bizoxinomosubena.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/f4a96d0814c1081dd1ab9dad34b8f0ac/xomexenosi.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/zaxeferokab.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/d00e944428448b8b3a6d2c1754795d5e/palufisoselojenis.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/47623119954.pdfIn PDF document text
    • http://cbwmd.com/uploads/Files/lovobemanat.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c6da8b9ee---10170685620.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ce66acde5---nuwimabomomuvabi.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071803702026---kezawotafalovimi.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/85b5751acd3dbdf1c6d5901bba9d5fed/70849128747.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=packaging+of+confectionery+products+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_off0000dd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD11 11056 bytes
SHA-256: 4be3e36240792b0ae76d2ae1e4f87fd05735575e0bd6d2d2041f151487a7ad5b
font_01_sfnt_off0000f6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D2 17860 bytes
SHA-256: f46bdb76c80fb422f8431ef439a7247cbf2cd7a46b71c6960c0ab15fd46b8e85
font_02_sfnt_off00012599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12599 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1