Malicious PDF — malware analysis report

Static analysis result for SHA-256 5efdc13a69d458cd…

MALICIOUS

PDF

89.7 KB Created: 2021-07-16 17:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 46a68afb2fc112558781227f98247083 SHA-1: e39e86cb6819c2042d2bfd9490ae00eab5eba502 SHA-256: 5efdc13a69d458cdb7d9004110bd39d33b8ac9c8031dc203bdef9401deaf9692
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous links pointing to compromised CMS upload directories and disposable hosting suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, combined with the heuristic 'SE_INVOICE_LURE', points towards a social engineering tactic to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/sei3v69rm9f6805e73nrlk5mc8/xawajamuladasogovagejeloz.pdf In PDF document text
    • http://www.benyowsky.com/resources/files/kizujepazo.pdfIn PDF document text
    • https://computerzone.pk/file/84808271206.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c27be264ec2---78715997963.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/3qsic8hva8r0npfsm0q51rk8r2/nawuxejeziputewumuzawari.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fefe7db0c0---15876313517.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/7d823cf294418a22d3a6f0e71f2d5a20/9407626255.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/75379781724.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/j2fuulajs4atcd5t41unurpds4/vofik.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/70435494170.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/28543120820.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/7pkntnc4vt1lmsjtoipa462np2/6300252089.pdfIn PDF document text
    • https://kar360.com/resimler/files/tizuxevoxuwinufosonom.pdfIn PDF document text
    • https://andrejc.si/files/file/vexirovarirepuvevifobi.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/tebizolarupakarimasigudew.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071980c9166d---netudirimalibag.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///7416042146.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e3204960c8c---745318609.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/38415391247.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab43a10357c---82544916739.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b01d42867---97064559148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=depreciation+in+profit+and+loss+accountPDF 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_off0000f6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E9 18152 bytes
SHA-256: 114c1e4fc7763a3d7fa2c8b20b03d676a5a1afcf29f043d05a253506851486c0
font_01_sfnt_off000126f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F1 10712 bytes
SHA-256: d71d1fa5598897ee8d0b68c7eae36bbd1f3141242a371e28d08b68df364be63e
font_02_sfnt_off00013fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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