Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3aac5f0ed2148e…

MALICIOUS

PDF

85.0 KB Created: 2021-09-01 03:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dc6030d49b796a916ae0042ab9d116a6 SHA-1: 6d236d50b64af0588b849c95ff85aa460a42c5d2 SHA-256: 6a3aac5f0ed2148eb374583ab0872cd29c048454d257938e1c38975b2f854451
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload directories and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/i0sut19gnmbo74fr4blpolpn25/1368884716.pdf In PDF document text
    • https://npkfertilizerproduction.com/d/files/40117836434.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc89426db8---xalofefibejedi.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/77886736724.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/guluralomutedovirug.pdfIn PDF document text
    • http://co-mit.com/uploads/files/59448149361.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/vupetad.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c12507522f2---83141169193.pdfIn PDF document text
    • http://fabtur.ru/upload/files/57037293924.pdfIn PDF document text
    • http://akademibt.com/resimler/files/lanune.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/saxesabojeg.pdfIn PDF document text
    • https://cecprint.com/images/file/wajunatexujegagu.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/taloxapeputepuxuzajefawu.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/87369230304.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2686df871---83440207169.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/81319040038.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/56749115868.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/f56c621f4c0a9d8dfcc2ea16ccb70d6d/72391614605.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3f938f99b---48077804727.pdfIn PDF document text
    • https://majubesar.net/contents/files/pulirepodaziwiluligo.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/42414149332.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=solution+manual+of+artificial+intelligence+by+rich+and+knightPDF 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_off0000e26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26F 18988 bytes
SHA-256: 9965b65ee1586bc83e1dde02d49d9fc722fce43e6940edfec6bc0f09348ac9ee
font_01_sfnt_off000112f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0B 11276 bytes
SHA-256: 20f5077cc1885051985757ce008cecb891e2106a57ceb7a48bca1a07adb342ac