Malicious PDF — malware analysis report

Static analysis result for SHA-256 38d46ad9c6becead…

MALICIOUS

PDF

95.9 KB Created: 2021-07-22 07:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2efbeec8db4fa1d64eec55a14a89140f SHA-1: 74f92445f269541717a5e9d696c33be1ae7f5d90 SHA-256: 38d46ad9c6beceadc0953cc402260d75b3c5fde47f5bbdd1f2a31932a79fc60f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links pointing to compromised WordPress sites, which in turn host other PDF files. This pattern suggests a link farm designed to obscure the ultimate destination and potentially distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/dbgr0qf1bkloftvc6qf7qrhao8/bisimuruzovepetipen.pdf
    • http://technoculture.cz/admin/upload/file/79022680768.pdf
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/42955818912.pdf
    • http://ed-web.cz/userfilesfile/43246039220.pdf
    • https://juvelyrikoscentras.lt/Files/file/narujijexotebigubade.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/5dd09215936669812b0eef116772c6f1/jefimifawesotafuxemefu.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/09da45d2a4fba003df1aefdd41133a5f/forofitexapidojizidinel.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/74ac4f2b0704c74a9395e04679cbb639/tagebivavosagezazid.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160da4f38bba2b---10351530613.pdf
    • http://schs1968.com/clients/861610/File/pifaluvepesemipuzefeb.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f035eff17a1---fesuvefogu.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b502ddd769---dopavozusabolunanuguxa.pdf
    • https://radmangroup-ye.com/rgfiles/file/mifukozosifu.pdf
    • https://bistakalikotenetwork.com/userfiles/file/lowidajojazeji.pdf
    • http://dobrasekacka.cz/userfiles/file/63696122976.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/76594657517.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/d6f67b3e9b9aba02f0fab94ac4b2ad9c/nipunanapuxolazawe.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607100f556b9f---mijijeg.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb2865a93e---tibosuw.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819ac6708c5---45285678966.pdf
    • http://dmhfamilyreunion.com/clients/4/44/44eff64e497b984d8b2945277059c9c0/File/vepubu.pdf
    • https://arzhosting.com/calisma2/files/uploads/worixopoxozofevirefeta.pdf
    • http://vejwun.cz/images/18081560789.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=bank+holidays+2020+uk+august
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001121e.bin
6471ad5b8136fc27961ea8dcbd7fcd695b088c681675c34f138d13444246eba4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1121E 17536 bytes
font_01_sfnt_off00014018.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14018 16792 bytes
font_02_sfnt_off0001582f.bin
76427feb521a090eca7f181943620868f5591cd80772c35339d286e60db5352e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1582F 10896 bytes