Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbc783baeca5a891…

MALICIOUS

PDF

82.4 KB Created: 2021-09-04 09:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c2d0a0dc24624bf46d5bb04500f533ee SHA-1: a98083294229aa1ffce269dfba5dbd5295f76f57 SHA-256: fbc783baeca5a891a68bb8e70866627dbef0c637e2005d0ba16b25f1f4ff5303
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites. The heuristics indicate a link farm designed to redirect users, likely for phishing or malware distribution. The embedded JavaScript is a common method for exploiting PDF vulnerabilities and initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=panasonic+bread+maker+manual+sd+255+pdf PDF link annotation
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3beb44661---25043138357.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607756a3d4d80---dajupok.pdfIn PDF document text
    • http://safarang.com/basefile/files/sujarubofun.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f39ce44bb---boxozesiziwezirafipig.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/zajupekojeliniga.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/tomeritinafib.pdfIn PDF document text
    • http://d4squebec.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/sirojelamiro.pdfIn PDF document text
    • https://emmaushuis.org/pages/43138352061.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/56564156796.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16103e78a247c6---87748553886.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/puragojeweger.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b69836fbc6---zatadekigezod.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875b81b2cdc---biputososesozizu.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/15959978777.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/372f974168fe1c6027be5a3adb97c976/tusoma.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/jodidosukenike.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/30043594959.pdfIn PDF document text
    • http://sochistandart.com/ckfinder/userfiles/files/posezinivuxujajide.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/2064062510.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9b8cb8fba---vuzisefubedof.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071663724e5f---kujuwigekuzuzewa.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7fba311b5---10480637198.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/nqcul7dror4fbkdorv04v9c3h3/36533360247.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/4411ce1db9e59e7aa43e56c1648a6adb/xonolafefekanob.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/kisafuvukusevufe.pdfIn PDF document text
    • 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_off0000dce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE8 16932 bytes
SHA-256: 1c8deede6362ca22fb1268ec2d78e8ce4459bcac0e3cf0be38cee77d59027c0e
font_01_sfnt_off00010931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10931 11268 bytes
SHA-256: b499fb0b9a72a108537c0181f1e9f3a8d544257c062daef394b654bbbb33f039
font_02_sfnt_off00012384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12384 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1