Malicious PDF — malware analysis report

Static analysis result for SHA-256 36209cfc14b51bd7…

MALICIOUS

PDF

69.9 KB Created: 2021-10-02 12:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 542420a504dcd31435508dee7eca8ece SHA-1: 5e57dac85a0847bd11043fdf767130622622aac5 SHA-256: 36209cfc14b51bd75e7ff4eb2a3cfe762f96258ec4087dfbbe0e5faa3384c0f7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/35c671da531947ebc94880653b036583/virenanukud.pdf In PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/8779260992.pdfIn PDF document text
    • https://ccvt.vinaonegroup.net/upload/files/sexom.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/vijeliwova.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151d9e817ebb---numezifogigumov.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/jamaramorifizamodadupamej.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/35398552696.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/tuvologibivakuzabix.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/55324112405.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/51491711109.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/pulaxexomaf.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/b8b5d902ca843158ed2240b82aabb469/faworiwef.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/28316071958.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/rizepeninijezibitu.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/f479e1ce6ee3d0c3796b9423c208b414/58351976097.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/zaresekepabole.pdfIn PDF document text
    • http://bacsionline.net/userfiles/file/23703768636.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/juxedobibig.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161415e161ddb9---41937408580.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/50991252666.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/63923533236.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=over+analyzing+examplesPDF 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_off0000b011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB011 16204 bytes
SHA-256: bf9e4ad4d74aff7e6335c10781ae43b004d776f7a6951d1bd985d21c7335c0a5
font_01_sfnt_off0000d918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD918 10744 bytes
SHA-256: 163726dd722168d23a1ad5ef7ad30bc9dd85803b893c7d12176d49239e1924df
font_02_sfnt_off0000f1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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