Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d5de90aa3169c5d…

MALICIOUS

PDF

81.4 KB Created: 2021-09-04 22:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 61579bb8b16ec8bcc25f2410d2e17d30 SHA-1: 3264ce4225bccbd170485ffeb475a702f25ffc09 SHA-256: 2d5de90aa3169c5d7a0509039479543d4162d51b4ede8140b821d9e20ae6cfd7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which point to potentially compromised or disposable hosting. These URLs form a link farm, suggesting an attempt to direct users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hiredriver.com/uploads/assets/files/godinozulepojukav.pdf In PDF document text
    • https://cargobull.cz/res/file/29273450590.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/wasejizonobopego.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612493bc3f74e---5993432394.pdfIn PDF document text
    • http://vincentpopetutoring.com/clients/d/dd/dd6b7bcf94cac99d3bed97cf8166637b/File/risamasapikukaj.pdfIn PDF document text
    • http://benjamin1908.com/clients/f/f4/f4560e3fe432b95d15e234f900dec36a/File/wafusekefutataruvonezo.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c31925c12---11925547747.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/lafalizififikumi.pdfIn PDF document text
    • http://integrotech.com/zdjecia/file/38063817320.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/kelosabuzanazidemi.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/sivewasogaduton.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/dc500dc03f4567e11770f934f8d6cbb3/17636797293.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/mavet.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/633163491.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c035a861cb0c4bd400e3f017a0fa704c/surovuledemuposibotevumu.pdfIn PDF document text
    • https://cubic.is/userfiles/file/puvimebomumogibipetu.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/8664dc08d95e29162e175a4c591650d6/20183161402.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/22980970449.pdfIn PDF document text
    • https://dm288.com/slicice/file/36614257722.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/g6vago8b82rh4mc73ges8gtat5/27847336523.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/67603765237.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/40397900090.pdfIn PDF document text
    • http://edelstar-mos.ru/files/xazozolajixaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=sign+language+book+pdf+free+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_off0000d7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD7 10900 bytes
SHA-256: d1cd4893864bf19b330045f4c8149d7b96550d5991584126eeece5584420afbf
font_02_sfnt_off000108cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CB 17992 bytes
SHA-256: 3712c6c8fe7e96e4b23be14aba489e633d97737219fc5759972d5245c41ff63f

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