Malicious PDF — malware analysis report

Static analysis result for SHA-256 488352db55c8a80e…

MALICIOUS

PDF

79.0 KB Created: 2021-09-05 05:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6cda3494cff8f9c9afa1d22a2b94edd5 SHA-1: 2c6d0368f2128c203fd89408588ae349d2f959d4 SHA-256: 488352db55c8a80e0e9efe4167f9971be653daad917f0387d06c16d0b109e232
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, strongly suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm its malicious nature, likely involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://krisoc.ru/uplcv?utm_term=modulor+le+corbusier+pdf PDF link annotation
    • http://quimis.org/js/ckfinder/userfiles/files/jidadu.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/0a215eff3cf391ee651b9ecb62f6e4f9/dilapudizalat.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/0291a740a1aa57ebad6d392c80688e3f/xobod.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/ponomijobap.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/0bcf40bb322adf08d87baf515f4b4646/62176256882.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/519e8742ac280a170f4c3792fdff74a2/74645491155.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/56258525810.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/pabawiri.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/64172758348.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/5361193032.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608066a683b5e---pudulidukifo.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/rokatemasidobexevumasola.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/koputanakuxifemip.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da924ad861e---woxezesopidovusuvojudo.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7f83b15f---97097972005.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/14f7261ef9c102fcddcb583a8cf8b012/96662687181.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613170a770f59---1917728437.pdfIn PDF document text
    • http://abnicum.com/files/file/wijowekize.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/likebafanerogixoju.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/86664719092.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_off0000d10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10B 18008 bytes
SHA-256: c408c6d487ac44140e133eed9be6a12e16e6e2e06e4ffb02faa2aa21a3654dfb
font_01_sfnt_off0000ff9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9C 10480 bytes
SHA-256: dbc4db06b4e59bac933fd1fbe2caa1cb5f0550f789ebd4309c21e5752d7559c9
font_02_sfnt_off00011744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11744 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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