Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e336afad75d1a1f…

MALICIOUS

PDF

95.9 KB Created: 2021-07-04 01:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6a326f86fa7d207f22ab4384b1e50aca SHA-1: 71cac3ab4136bb1ebee315bd727bb8a44169bcf9 SHA-256: 8e336afad75d1a1fec53ed2438d8bc7623caf9bd486dfc1aaffea53a59fc29a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also features a link farm pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious or phishing content. The presence of JavaScript indicates potential for further malicious actions, such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://musikkursus.dk/userfiles/file/navofapamiwam.pdf In PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/er9hjriiqf75tgeic7meqbni56/vetowejofagalutexoped.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095ae22d85e5---jewabelefafif.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/f3b9bdc8f299c741d26065aa92634c02/26157334935.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e985cadfa0---debetowatajugesot.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/875a7eb893840978080b413a49a95cb9/42640165336.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/be5ba36d14970461b17db1a34a0e8cc9/75724550438.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088cfd10ea39.pdfIn PDF document text
    • http://vinmexindia.com/uploads/gixiwokugoduvat.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/9c6116f87a26b349f249300509973e08/xatazuguwula.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/ruxotu.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/tikubob.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/1ee2e25847325a09c78e6225698b2b47/98492478958.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082405a79943---48075945619.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/81284338745.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/betiligibufusemotaremo.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/48032908735.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/82337295540.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607e446f70557---98807290251.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/4bff268a86da5b2c045547e2333687e8/12855112535.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/963u2q1000080g6mm2kd8kk6fk/97230071154.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c08de3e433d---nuvezapivilabaxewiziber.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/97lscerjbde12blnc9cpc4mai7/33816724705.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/b6dc5a408d7bfa1b4539fca2d9e13d14/kubixu.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c4f11986d---suruxivukododo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=apple+head+chihuahua+black+and+whitePDF 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_off0001150c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150C 17204 bytes
SHA-256: 78963400633e5d918b724a39c381e1c2ef2d4802b654d933159b559fde206ff2
font_01_sfnt_off00014215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14215 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A2C 10620 bytes
SHA-256: fa2e14545daae12b6fe22adb6e77373f1d0d9f82b32be9c85a09fad1cdf9f40e

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