Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c19a6d1cba0f5ba…

MALICIOUS

PDF

89.2 KB Created: 2021-07-25 15:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 11badbe318a11c3cfc594254def2d888 SHA-1: 584f3774cd7a34b899a6722ac3395bef229147da SHA-256: 4c19a6d1cba0f5ba3f30882b3ec3017cbdc1c419a2abc1ae10880a2683aba116
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The primary purpose appears to be directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://ajtoablakcentrum.com/_user/file/64240418871.pdf In PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210606094535.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c7511058b---dutukexadelevofap.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/47949290243.pdfIn PDF document text
    • https://edcasys.com/ci/userfiles/files/bijawabosov.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/6435116508.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/55004493947.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/tuzodatavasujopekusibiwo.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/l0s342227iik33m2sm6k3no66r/didenezada.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b51167b8cf---lananonimomuxawud.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/zorodexomopemawudibexuk.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/88117455872.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/8be622aac31012e1d27c3fdf69399a65/xubexebelopebezagokutasog.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/midiziwodigasanazu.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/96627836966.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/fd813f67682b4096c9c790ef6e270563/61003867184.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/2a3702d44198ed0c5e4cd9c1bf463772/zulugila.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/b47927ed2bbb9521f78f11581e45ebb3/jatesawitotonapew.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e022f35c6---99466232087.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/widomila.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/ufmsmg5klhjqspnmr0de7hbbbr/xubuwezoj.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/kuzefesoda.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b75542232f4---luzijutizitesoludotekaku.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/57573397713.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/46759831207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=khatrimaza+hollywood+war+movies+in+hindi+a+to+z+720p+downloadPDF 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_off0000f570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF570 17448 bytes
SHA-256: a41f1ea64669da8f31bc1bd344fd4703ad18b9d96e2cea98f3ba1850de39f11a
font_01_sfnt_off0001233f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233F 11264 bytes
SHA-256: d295b4ea7cb2bcab24ecc950bfca3a4e95050947e9a6fb4085d4e5fd90b03fb4
font_02_sfnt_off00013db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1