Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5027b28ba7872c…

MALICIOUS

PDF

76.1 KB Created: 2021-08-30 04:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3598820b3aea6a78bfcaa1e9518dfedb SHA-1: 186948d50ac9e05f05958a6c7c8d3cbc085815e4 SHA-256: 5f5027b28ba7872ca337c0dff1fbf16130770c24424801dff0a062370b15ebf3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a link farm pointing to compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload via the embedded links. The document body is heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e971a03d8d---litalosiwop.pdf In PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ec37cb15b---12126905243.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57822109be---84057637226.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b0777a16640---49570385590.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-6/20210506105519610442.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/lorewotifokabujupa.pdfIn PDF document text
    • https://chptravel.ir/data/file/84106050050.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/7fb0e3272146e47ec3fb3b1359fde249/tejagusux.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080aed88f20c---462363598.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/zaxamulovupupof.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/xilotamolofelesenokujur.pdfIn PDF document text
    • http://hf1968.com/clients/48820/File/wotuxujijev.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/zixovagelijo.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/molefugebifuxomo.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/34523864676.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/79476279213.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d76664a18---fobata.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774e3f79f60---59322833822.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/ckb24od4qube2eltu2ruj6dhc0/ginabakafulemo.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bapebeki.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d67f14c774f---12366628120.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/3m5mt3qo86gb7s7lt53o7a2js5/28009024307.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1ff82fd1c---pinoperusexo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=early+signs+of+prostate+cancer+in+malesPDF 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_off0000c84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05D 15620 bytes
SHA-256: eb343b35d16636cf49714e13f85a5060897b4e2b75d580faf0347136acce267c
font_02_sfnt_off00010824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10824 10920 bytes
SHA-256: 3c3d0f3bed80b1068544794cbea8d6059811a74339dd9e58af3b9e589c24166d

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