Malicious PDF — malware analysis report

Static analysis result for SHA-256 062120444a122d24…

MALICIOUS

PDF

87.9 KB Created: 2021-06-30 22:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3e86ba72b3e418799aca870bdb02bb97 SHA-1: ba7ecc1d18f2f4e6b72c09af69f299b9d26da339 SHA-256: 062120444a122d2410f6775e09edaa2774417ebb4ef4cfae3f5e693a8cc1bd64
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and numerous external URIs pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://imagebeaute.fr/userfiles/file/80596530204.pdf In PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/r43dam7pjaa3gpc46s5jpcd0kg/96830897101.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/cd351cfc0a9de20ca9d29ba402192a8f/60470266048.pdfIn PDF document text
    • http://cfacgroupe.com/uploads/FCK_files/file/13468176522.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/lb493kjvblirof9r3q6cfqo2nr/kapovaxowivupukodagu.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/7cf7cfe2861ce0975ba844b43b464706/31347982323.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/81350743785.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/f2uoeo4e2uo7udp9raqku3kgi2/rosixuwi.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/tasanusaxunofugexomo.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/2f4b9e40788613ac867f23ccf90576e7/kolago.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/zusugopuxemepezuralu.pdfIn PDF document text
    • http://edgecs.net/documents/85392024218.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/le4p0a10oa20h2816459k1d8d0/51308592471.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/nagalabigabe.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/sagudunujaxise.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/kuxisabaromutemivibebak.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/b384a0ec3272dcacda4d2194b3a04066/pivujawogudifagovemiwok.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/39130266019.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/27827291824.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/7146026008.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/374b269494471c295bb2a38a85080685/53963931597.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/jabejiwo.pdfIn PDF document text
    • http://newo.ru/files/files/rokowofetonog.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/90hd3hq2utomhj3ubfuu5hlnt0/32421892790.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/josuratexezisadipokeji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=free+printable+reading+comprehension+for+grade+1PDF 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_off0000f5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AB 16552 bytes
SHA-256: 3124c538db8ac3f84a27c9735cffd47c1299db03850a8d79929ab1fa011f531c
font_01_sfnt_off00012051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12051 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13868 11236 bytes
SHA-256: fb1fb714fba9af96d21899a6cf99f46cb2f17fedf43c3a5bc2621105e2ce9f98