Malicious PDF — malware analysis report

Static analysis result for SHA-256 321542db15b2d6f6…

MALICIOUS

PDF

79.3 KB Created: 2021-09-03 16:21:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c36b164e71f8e3a547f2d77230a9e9ca SHA-1: 95fca5027d546f93e813a746e3b6ca77f00b5d1c SHA-256: 321542db15b2d6f6b74b841dfff69af73dd590cba01d45bbeb7fbb8536a8cbeb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely contains malicious content. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting an attempt to host or distribute further malicious content. The presence of external URIs and link farms indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://theofficefurniturestore.com/ckfinder/userfiles/files/84401644399.pdf In PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/wirafipogirire.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/34040345402.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dda73d76e4---91901980935.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/fuxonekitasofodosad.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/zusiluririgukodab.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/zapobunasomewoxojoxifu.pdfIn PDF document text
    • http://allasclub.com/campannas/file/30013090597.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/a39c541afd13428911a54525f18adfb9/57656561228.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/4f5581f5bd6e039e00a9f48399abb403/mupiwoguset.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/domilux.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/16887831708.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/m6m9be89e6vs2u4pvfh5l8udug/xosadijavumuzuxabiv.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/15806407556.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cd4e93a6a---72123270081.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/11334896546.pdfIn PDF document text
    • http://0930actress.com/files/files/78950968768.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/xubebiviminewuredorura.pdfIn PDF document text
    • http://progetec.org/userfiles/files/33966714351.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/6536c108bb507a143069f912ebc26d5c/52009700280.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/busefaxodugo.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/66207358022.pdfIn PDF document text
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/duleweweluderet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=honeywell+cl25ae+evaporative+air+cooler+manualPDF 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_off0000ceb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB5 17936 bytes
SHA-256: 7b9547b1ee09d634c8ef8aff015a167b90a6b51ce2db63381304afcb7e2fce01
font_01_sfnt_off0000fd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8C 10980 bytes
SHA-256: a551041cce2f47cecb37f7e33be1b94dd874661ed73e22baaf242565e13602fe
font_02_sfnt_off00011728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11728 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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