Malicious PDF — malware analysis report

Static analysis result for SHA-256 92e14a40328fee24…

MALICIOUS

PDF

81.9 KB Created: 2021-09-05 23:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5ef542ecd337ab45a2d473228b67d32c SHA-1: c241d5d0bb3e98e20b4c595a4f986423b872b33c SHA-256: 92e14a40328fee246441719cab17ed31c601bb2d7d88a8294c035879915cc4bc
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links pointing to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or SEO poisoning tactic. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomorecpapmachine.com/userfiles/files/35878816425.pdf In PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160ba99209f1b1---bamoko.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/38345510836.pdfIn PDF document text
    • https://atl-50.com/files/file/waxeloxabezalukujavido.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d62bef11b39---89994031203.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/wibesufixetowinib.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/977038937.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160768bd4d693a---zuvobobefoxot.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/bukiwixipadopudaw.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108465e169f2---wopotewamezof.pdfIn PDF document text
    • http://holzbau-napetschnig.at/kulozogupegukizufe.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/f40a685a33f26682632cff0d670858c1/masigewutijenozipet.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/46255760933.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609891485deff---vogasozulatavunefukidil.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/367d21e450c214ab4aefd7a7cbd92f58/52599527206.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/wuwivuraxekafobomi.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/55071028614.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/712f2ac36e9e2b4ff3a8a4b258eca5b7/7542100616.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/fumukaragaravojipujo.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/29090400639.pdfIn PDF document text
    • https://marigabung.com/contents//files/luzeso.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/64193612832.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210821020516_31ywb6.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/movisasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=netgear+n300+range+extender+ex2700+manualPDF 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_off0000dbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDA 10856 bytes
SHA-256: 0db09cdcc2e3383909762ce11f90f1f5a4b52b6c889ab51110a88a3564a59cc5
font_01_sfnt_off0000f4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DF 17968 bytes
SHA-256: 7779fbffb152cd67376c676539011555e529f8c8bc3752bedaef2386fd728406
font_02_sfnt_off0001223d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1