Malicious PDF — malware analysis report

Static analysis result for SHA-256 22bac244de5180fa…

MALICIOUS

PDF

69.0 KB Created: 2021-09-25 10:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b8c5133f36735cfad69ab52903dd6bd1 SHA-1: 9852fb6f3baea49af66dbc1beeb239959f8489b0 SHA-256: 22bac244de5180fafa34bdcd667d8c84aea88b330c19041707549fd683ff568f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms points to an attempt to exploit user trust by directing them to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=android+studio+menu+button PDF link annotation
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/7e6978fa542da9d6a92a0f3ea5ded974/10002078678.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/20591917684.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/dekemitibunet.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/lubatuwekekafuraleve.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/415ea9384bb4fb4ca8d888f8afb5f996/dujavurol.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/norojekopodo.pdfIn PDF document text
    • http://flirdining.com/uploads/files/texazusapaselututoba.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pezasumakolilerinasibu.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614ed55683178---luvukoxawepegopelemorebi.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613e30c5d2110---pokiw.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/jozewuzakoterare.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161402d6af3ae8---kiregej.pdfIn PDF document text
    • http://tayles.com/uploaded/xuvoz.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/daxemepaveporop.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e2431c233---4020028515.pdfIn PDF document text
    • http://vanhacollection.com/images/files/geligimus.pdfIn PDF document text
    • https://mklaassen.nl/images/file/72093858220.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/gosugi.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109210121335794.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/mesom.pdfIn PDF document text
    • http://rapet.hu/files/35147441170.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_off0000ad0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD0B 16348 bytes
SHA-256: 0c4af0d3f04f532eba25fa47c1466c65f4fba29f4cd9ed4a0f904e6056ba9d20
font_01_sfnt_off0000d71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF32 10424 bytes
SHA-256: 9293a4eba976cd35e36da39cab155875e68842c8ec693f50c5cee05cfe0c8cc5