Malicious PDF — malware analysis report

Static analysis result for SHA-256 831051b198ece1f4…

MALICIOUS

PDF

85.3 KB Created: 2021-08-29 22:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 4827b37bf5b2f9d413cf4ea14337dc50 SHA-1: a617dd8be07f01c4e70f5ca16186b2fbed9b2069 SHA-256: 831051b198ece1f4c8f3cbde75e8c579df54829cb342bd13cfca940c8a45118a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d90e39e30e---makulugodo.pdf In PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/07d94acd31b99fbd7ab1dababac5f98d/nevorosuborigar.pdfIn PDF document text
    • http://puppiesjust4u.com/clients/c/c8/c8a8d0e690f73854b1e7a5fbb9521f82/File/94273050891.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/2dabb90a20b9e7179728308f0941b971/83222322121.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/vanofidevavowexe.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021072017214685.pdfIn PDF document text
    • https://pratham.one/file/fovepetukasape.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/13022397584.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08d3e97459---88400335409.pdfIn PDF document text
    • https://lazerom.pro/media/file/guxezi.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/fodunaziluwuwuvifikod.pdfIn PDF document text
    • https://bbmint.com/userfiles/file/wukijikas.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/tekazoboraluvo.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/ffrp8tbb5uarlskkvfa45q2lta/23617576207.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/35248868866.pdfIn PDF document text
    • https://lemanssrl.it/file/7808073650.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/bgcdssimek07punvuomlm0cgg3/woliwebunexemukizej.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/xokitekojemijivamu.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/zikes.pdfIn PDF document text
    • http://goref.ru/files/file/seludukugawizedibu.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/27013263302.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f6bb21fbc---28739542361.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/58585824519.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=hero+of+the+month+empires+and+puzzlesPDF 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_off0000e54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54A 10912 bytes
SHA-256: 9fa5140747d97bf30b37d8c5705476ed0cea7286cc443723cb44cf64ce58296b
font_01_sfnt_off0000fe54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE54 18596 bytes
SHA-256: 31c72964669b77fc65073b45c5e62fde88ee0333fc2f85041236a93de6dc0f12
font_02_sfnt_off00012f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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