Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c859212bed95318…

MALICIOUS

PDF

81.5 KB Created: 2021-08-19 02:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b63a3781ac9e74bfd0a7f715b0178c62 SHA-1: 979e413e48b48d07cb634c7467efd8140abfa0c7 SHA-256: 4c859212bed953180ac6b02036dfaeba07f6c37ffb6bb8cfd3ed6b4495cd2473
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, many of which are hosted on compromised or disposable domains. This pattern is commonly used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://laborke.ru/uplcv?utm_term=rapport+de+stage+bts+fed+option+b PDF link annotation
    • http://thetsaban3watnuea.com/UserFiles/file/95076062287.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/kajupuwenubanus.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/nukesakubozapiri.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/foderiderexifateturiwiti.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/7d9221eb876a6a9764736c24dc9604d9/jijunozagux.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/66182787182.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021080623465780.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/83529073231.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/kadiwemewigigugerajexe.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/xadopekowugakivozema.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/171801283.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/xilipofiwalososez.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/vlqvms0qrvgge5hjah0j5qlue7/tabowobojamegefemewofuka.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed5bb3f7b6---wemodulinujo.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/31904643460.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/lejegimefa.pdfIn PDF document text
    • http://wahiclassof69.com/clients/874294/File/nutejavaj.pdfIn PDF document text
    • http://ridendo.cz/files/file/86721568366.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/regavojiwo.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/ad004caa1324f82966f00e281b3ed0f4/jilixar.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ada5d2360da---23414626248.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b61bd8f3782---60315433550.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/suwavusafojobuwiva.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/vuseno.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/73032983271.pdfIn PDF document text
    • 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_off0000d875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD875 10812 bytes
SHA-256: 5720a73168820f74a9b81602932930f821fe0a03ffc044c9e5aa7a8a8f6c1b71
font_01_sfnt_off0000f120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF120 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10932 18100 bytes
SHA-256: 57194937fd74a97ea785e7c40e4dafe26081612df1d2adbfcf57925074d3e48e

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