Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc992f18a906d7d1…

MALICIOUS

PDF

84.1 KB Created: 2021-09-14 00:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dab19423195fa2bf8fba03bdbd72e4d4 SHA-1: 0e85471b0d1e597831ef1c41b03428608f38b9a8 SHA-256: dc992f18a906d7d18ec14410c9908a18abc5e2568c7a0262089c9ccb0b38c9a6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, some of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of JavaScript suggests an attempt to execute code or redirect the user, likely as part of a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/1q7uo53itj4489c2ocr64rq67g/92514667257.pdf In PDF document text
    • http://steffis-strassladen.de/userfiles/file/37006676482.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52097575721.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/6334333084.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc4c0ba514---witoza.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/dobanibumoseraralax.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/bavivedebilupajo.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/86078953600.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///97755905335.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/e01576b22605fd2ad8d497e3cfdc8a1d/50025946599.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/82623312647.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/tubetugixosanijaneriwe.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/zonoj.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/40324889951.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/vawibaxiwelidagiga.pdfIn PDF document text
    • http://innotack.com/userfiles/file/gotonozuxel.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/masus.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c83a0309e2---26881894886.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/37589191307.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/2604156417.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/50260708915.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+spanish+love+deception+read+online+freePDF 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_off0000e522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE522 17320 bytes
SHA-256: 1e7ad90634f5d9ce2d78c1e28211370853f500838631b975f78c62337aba9a65
font_01_sfnt_off000111df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F6 10748 bytes
SHA-256: 5f3d71d58dfc49c05f04a5baba60cb11b834aaa1d61eaa8a7d79d98b95bc8a32