Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c4e7e0c402f9c0…

MALICIOUS

PDF

74.3 KB Created: 2021-07-20 07:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: dbfa74503785b902897b3169f16738ff SHA-1: 94474b0a282155b6c6349f593088cb173985b85d SHA-256: b6c4e7e0c402f9c0a7494eeb46fd4f07a59e9f7d0c054387a46ca926eff36c9b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains numerous external links, with several pointing to compromised CMS upload directories or disposable hosting, suggesting an attempt to lure users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic findings strongly indicate a link farm designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ippon.lv/uploads/File/daromefilewilidumadufage.pdf In PDF document text
    • http://mai-colle.jp/userfiles/file/26635599886.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/selemaxijuk.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/datuxijesedoroko.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608742bb9d688---sesagarirexukadewekevi.pdfIn PDF document text
    • http://bawwabatrizq.com/userfiles/file/xetasuxuzi.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd80fbf3184---kozata.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8d2f9f889---28025809530.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/17499369195.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/52318177739.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/o7vts7md1r5tdfvbvkhnbq9e19/senudes.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986b8b501b3---5455334631.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/vavujafibawibe.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/6421e2e20c4ae17e4460e5c85bc166c7/4454936050.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/2bd4005a4b67433b4b186efba76f9626/35177141660.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/58477802997.pdfIn PDF document text
    • http://prof-cosmetics.com/upload/files/16177552650.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/reo4926vrv2joncl2u9rr9jj22/mogelilupititawafosofu.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/f809b031dc0926b03cb39090e0c24f94/xupuzezizifotewaziva.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f72edafa77---28849515285.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af816c52a1f---zotomotati.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609eed25c1fd0---xisazikidug.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/12431522722.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/7f49039e43f466741cc239cf30b0233d/solerawutekugiwogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=science+connect+2+textbook+alberta+pdfPDF 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_off0000be83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD695 17080 bytes
SHA-256: 19a1c104c386b3b38b4ada1077983cd5e6a08e124ea796a5105559881b138752
font_02_sfnt_off00010264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10264 10972 bytes
SHA-256: d9c33bf5602310688ae7f99b0f5519faa104558b83085928f4d249728480bd75

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