Malicious PDF — malware analysis report

Static analysis result for SHA-256 5142632ec4e48e3a…

MALICIOUS

PDF

80.8 KB Created: 2021-09-03 23:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 78958a449798fc3f6844c3f440b9ca15 SHA-1: 9178a2d9d7a7581578cc852de3a6c46ae61f5c29 SHA-256: 5142632ec4e48e3a2a48e25388eebe282f9da0c76ce09f39936e55ce7aa16c50
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and links pointing to potentially compromised WordPress upload directories. The ML classifier and ClamAV also strongly indicated maliciousness, specifically classifying it as a phishing trojan. The document's structure and embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/2juta8lvtl0t22nurfhcqdpdur/sajidigetu.pdf In PDF document text
    • http://goldnumber.info/userfiles/file/divatabarute.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/84875591146.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/vivejodizukibetogil.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/61827985972.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87ef9673e---niromipozipezujikevubeta.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/50254549087.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/zujop.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/d602b61018b94351eea38a2335d5ab2e/gunedofarogesasefuxe.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/8au84ifjuoeqpme80v3amtebhk/34786439463.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0762b7924---vapafezisidepiwixotafog.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/bbl0u4tv9o7lsfkmoh3o2bjggu/20947270496.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/3941fb9dbd4f9bf757d489cacb12e01d/5625877898.pdfIn PDF document text
    • http://vilniausgreziniai.lt/userfiles/file/49855067167.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/87d09132b985ba0a770cce06333330a6/refogebedi.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/gagatexet.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/ai797i5q9mgt43rqldj6neheth/musuluwifanaxe.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/josezemewogivabifazu.pdfIn PDF document text
    • http://statewideroofservices.com/clients/b/b8/b825a24af54c157c196cf52173d75bf0/File/pizonalisemasod.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e0acece56---winusafegekarosi.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160833e51989a4---karumanobumagibagetuxuxa.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/2652e1304f5ad3609d4945cf3e793587/mulisixinugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ielts+academic+speaking+practice+test+pdf+2018PDF 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_off0000d542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD542 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED59 11388 bytes
SHA-256: 04fb77fefe0bcd97c7a26ba2805a24bf4f5d2091ead435f6c906efa163bec162
font_02_sfnt_off00010809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10809 17616 bytes
SHA-256: ee8bb7b9fc9bb35ce56f28d06f1ee69143850b31befe9b1f5264b303da02da05

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