Malicious PDF — malware analysis report

Static analysis result for SHA-256 97aae6c362e3b8df…

MALICIOUS

PDF

93.2 KB Created: 2021-08-16 12:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: f098f2c9fbb855f27ec44b1c6ba8a946 SHA-1: 3c83b597cc2a04d4b95d6833e3c09644b19e91ef SHA-256: 97aae6c362e3b8df40e4378795626d654a4bc4a0311285fcd485d443f928fc78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/c225ee65ffee0ab2621a5e1ad4da56c4/18662589865.pdf In PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/1a43743b659e45ea87e5097faeb15b84/40410195335.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/o8tf2f0hbkbihm2mbfr58c62t6/wuwerifojavizepevu.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/2cadc68b67b0c63a9ec9c32eb07faa1d/77021305404.pdfIn PDF document text
    • http://www.moyekolodin.com/files/11262343597.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/43753836825.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/64131802565.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/rojegete.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/4cu6fh6lmrcntkqnh4rqdd29d4/kadedotojezopugadebudefa.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/23380f9c31be4aedacce8907a7fe5bca/73721072208.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075e31d6427c---kifagetepexosolok.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/28132213187.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/boxoropikugirobowog.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/serazatopunoxa.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/nuzixiwidaxuzarekiled.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0e4a151f8---vitixezufolub.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/xigopip.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/50489602634.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/wosusukopatulonodipu.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe13847c54---26394203037.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608000ac3380c---89354432191.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2e497efcc---temexosawanozoxet.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093b7d329679---83909893072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=assassin+creed+game+javaPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9A 10624 bytes
SHA-256: 992bb30ac009dbd65e9396f9a9a8c56f18b840c72a77837baba3db7f5123964c
font_01_sfnt_off0000f59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59D 19444 bytes
SHA-256: 8fa0f42e23952d93745545ed22aa2140ac01475682eecb005a19d3d9978b1717
font_02_sfnt_off00012895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12895 17444 bytes
SHA-256: b61b919d3f29f2e5187d40a83dffed8cb85d8b02b081eafbdee58896c7d50aa2
font_03_sfnt_off00014269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14269 2828 bytes
SHA-256: 807fb500a0c0e8f15c85714679310a4dafb93499da29b31027c60244e8e2d98a
font_04_sfnt_off00014e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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