Malicious PDF — malware analysis report

Static analysis result for SHA-256 609aa3bf9be1f4c0…

MALICIOUS

PDF

84.0 KB Created: 2021-09-22 14:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0d6672bc02f06298f8d3067582c063e2 SHA-1: e48aff8d2c0ba01e11566569b8bb00496be6cef4 SHA-256: 609aa3bf9be1f4c0ba332b348d70b0b7204d09e7e5535c2ddb0cf3d258320976
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to compromised CMS uploads, suggesting it's designed to lure users to malicious content or download further payloads. The presence of JavaScript points to its use as a client-side execution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://oniceh.ru/uplcv?utm_term=apk+hack+slot+pragmatic+play PDF link annotation
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b023ee7a5e---larinara.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/n2ja6s96ebi8pu83ld2ndrmvfb/wegekupu.pdfIn PDF document text
    • http://adatarimhayvancilik.com/Images/Media/files/timexobulusozowuf.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/xebisavake.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/mopadasulosanopufeba.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/9b7nn4o6d37re9q8k4pqreqgfp/88492943496.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/godezuxixolesasovubum.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/velesopozaz.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/30352062644.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/63416045863.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/najiwoxamuxuzulititugux.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/pimotuvevijadewidi.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/bivuwidevisisux.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/17519125812.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/e6bc9771304bff98113a9f8707247873/kumax.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/giragakufawogowil.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142745d314ef.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/jegabevum.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eec29d4388---61274561755.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/nojowa.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/1843664476.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/buzekip.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_off0000dbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C4 10772 bytes
SHA-256: d6f5cb4d159e7f7e753af1da9195056a54e7ea712c053a95abaad83163d14016
font_02_sfnt_off00010caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAF 20624 bytes
SHA-256: 5945b600471738e1d3863333eefc2032da318a74048def83b728f159401b2dd9

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