Malicious PDF — malware analysis report

Static analysis result for SHA-256 34a597d000dfd198…

MALICIOUS

PDF

90.3 KB Created: 2021-08-14 16:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2500bfe80239e828e3f475408eeaf398 SHA-1: 26ce900aec853f4b0bc9ce3a4c7c008d38226d13 SHA-256: 34a597d000dfd198d761bcfa0cc9ddf15db2c069e4fa29467add265a31fc100c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous URLs that form a link farm. These links likely lead to phishing sites or further malware downloads, indicating a malicious intent to redirect users. No scripts were extracted, but the PDF structure itself is designed to host these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=bulletproof+car+gta+v+online PDF link annotation
    • http://denkobarbell.com/_upload/files/87206197836.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/bb080333370d7bbc0af2ec323edc091b/40183202625.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160e5b4fc23b04---foweremi.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/minutumizigulezore.pdfIn PDF document text
    • http://gdaniec.com/upload/files/60039007046.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087805f84829---vetowaret.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/d8vmun6573of53ln6q84bp5u27/jifefanemeguzaz.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/99373661222.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/lazafavip.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/eb81a1c33d50b7cd4d246c6ef48ea390/mugawipoliruwujejegomol.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102f8f157b0a---fexetijol.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/75307213547.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/somumuza.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/puparazelulela.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/7b87519f3b531438d34de2e9a2bba15b/balebujurujili.pdfIn PDF document text
    • http://ooexperience.be/assets/Image//files/88228679230.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105191512.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/36568103434.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/u7gevkseakb4054aldignalrc6/buwaxovej.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///18030355163.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/39954147077.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094304325dcd---33618360531.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/bqa8nba0c9ao2s6975aku8ob93/kumubusoz.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086408adc298---sevixifivotojujiragukira.pdfIn PDF document text
    • https://digireg.li/upload/80169543079.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_off0000ff9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AC 16548 bytes
SHA-256: 8d865cc2007c17b28cf790a774e47df864aa3e9a62ed322338ad671c828c52c6
font_02_sfnt_off000142d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142D9 10704 bytes
SHA-256: d045ccc85bcb785abe9d586d11b09d87b36d0ef70a2db75e1eceb91aa5178661