Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb4f167e923c527c…

MALICIOUS

PDF

80.5 KB Created: 2021-06-25 22:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03a7add3ad447f16fd1f5b302dfe4152 SHA-1: baeebace3c532ef3aa9f5e79cc901fe49dc14cba SHA-256: fb4f167e923c527c031c88763cb73edb873f1e51cc5a354fb5b9e1ce3f575b8e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites hosting similar PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be acting as a link farm to distribute further malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b09a3e3e90---xodovumiwujebekinokij.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d53e28fd91---xuniradediwekekitu.pdf
    • https://hansenlight.com/UploadFile/files/77605624265.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2030eeb07---vugamomepakaliwareluvil.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/d416bm2r8et3psraoltftb6toj/7571776543.pdf
    • http://arablift.net/userfiles/file/vunutobipididerodeguzoro.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c16675a3471---morosufuv.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f148a378a---gatudosavipumur.pdf
    • http://diplomat2014.ru/ckfinder/userfiles/files/basoxomugamomijaxevipebi.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf53daabe8---73084653821.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8453c3ada---6040345563.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/ef5181f7d2a2d89ed86c2df786e1dcd7/raputawedavage.pdf
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/759f87815702b982764df334278fb923/1768771966.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1608413c6da964---72009317382.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ced45d819e---34136661052.pdf
    • http://www.sport-konyv.hu/userfiles/file/gosizoxik.pdf
    • http://global-insurance-broker.de/downloads/viguvufojadupazizuweme.pdf
    • https://bititechnika.com/uploads/file/zilidakavufezum.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/mi3mmj58og8p7mkkgnmt508r37/92627671565.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b772b89acd7---dexixumowomawuzugemef.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7544c47361---zukej.pdf
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/13671866177.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abf570e314d---gepupaxutewekaf.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=literacy+and+numeracy+professional+learning
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d737.bin
f21bc72ef90c99430321a06cf71bee46f481b5e5b185c65b062812e0ef2dfd78
pdf-font-stream PDF embedded font (sfnt) at offset 0xD737 11136 bytes
font_01_sfnt_off0000f107.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF107 16792 bytes
font_02_sfnt_off00010919.bin
d50f4055cb319f9f805d96aea3ff92dba3577326ec77b9344eeaaa62b7b7efe1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10919 17076 bytes