Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c3356e739c6549…

MALICIOUS

PDF

75.1 KB Created: 2021-09-13 11:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e5dc6a2e5dba3551f888c5f5f956cb04 SHA-1: b78b6a6d25a8a2bfd6569a8c20c0a0aa00c09bde SHA-256: c8c3356e739c6549bd87fa6ce72a342224f43c469994fb280874eff0be4720ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to potentially compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, appears to be generated by wkhtmltopdf, and the presence of external URIs and link farms indicates a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://turnyras.lt/Files/file/judiloguwobojokifivep.pdf In PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/79407365330.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/31579631538.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/zarezirimaf.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/64085304889.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/19105617283.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/sujawisibijatavepurosobo.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613032e1c8e53---jetaxudivabewufefev.pdfIn PDF document text
    • http://glassick.com/userfiles/file/98506881758.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/tibegegez.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/vofusejasowilofode.pdfIn PDF document text
    • https://staging-info.sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/pomeparitowupejepirejevuj.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/vanowepokizifukigejabemi.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/10628253166.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/44351720207.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/5711672313.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137c49b22eec---901934324.pdfIn PDF document text
    • http://ccadl.com/files/20210909221333.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///wepogilovezimibinemusapiw.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/23342236733.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/8471c01957f50c841b87611e6dc3f38d/99435892919.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/5t34dte00scufbpamrcrc4kgjp/84728225959.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/69103406951.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/winusavomofexilemubaw.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/57427291702.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/nefan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=android+has+sent+you+a+sprint+voice+message+iphonePDF 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_off0000c177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC177 16856 bytes
SHA-256: 9acdb289fe780c838ac2e338436e014081859b78fbfe8fed255a918be4f34844
font_01_sfnt_off0000ec50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC50 11176 bytes
SHA-256: c1cd243249c7b53de5f25a005bd16e91a109de5e8a2f46ea5e9115f6855991a5
font_02_sfnt_off00010623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10623 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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