Malicious PDF — malware analysis report

Static analysis result for SHA-256 c46429ffbdca1a48…

MALICIOUS

PDF

77.9 KB Created: 2021-09-02 09:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7bc42a8660e88ee3093b199847914c76 SHA-1: 16dcf3b3bbd704c9f8c27b6d6119e2d377fcd624 SHA-256: c46429ffbdca1a4848127ffbe1276c5a7434358b2eae72e44088df867d8a6eb8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=kiss+me+like+you+mean+it+olly+murs PDF link annotation
    • https://vinacoma3.vn/userfiles/file/9829201169.pdfIn PDF document text
    • http://vlajamo.cz/images/file/88234104849.pdfIn PDF document text
    • http://retailcop.ca/files/wizunuguwinemukije.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/pekaxigikelaguge.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/81656772386.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/kutanakizepunabegirukoluf.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/8ec0330b72d919428a2fe1d1a6c46c06/42190074260.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/6o684hpsrocqm9a44fbv6a7ue1/jalemukowadejasaluz.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/jazipefurisizevimiko.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6ba5d3909---42200600503.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/96973709525.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/44710932000.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608625373d96c---18452468142.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/7mvjitjb4shp4arpsuj9v6ln60/saxowiwifekeziwig.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/varizaditizopoludituzupad.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/49487559965.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612eef3318faa---63487483695.pdfIn PDF document text
    • http://teakdeck.pl/files/file/ganefatetivudagejebat.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/topimupuzado.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/63161431257.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/9a3618bcbea2823e61a3e86e8eb6f193.pdfIn PDF document text
    • 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_off0000cd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD87 17076 bytes
SHA-256: 176e6e8a8c2a2ddfda1dc54d3a102d4585b6ce23bb20120bfe42f8bd8af4c045
font_01_sfnt_off0000fa01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA01 10568 bytes
SHA-256: e8ad6714a1fcd70c3f6f9f1e7f1929c544064eb9745d682d25efd41e1d46b264
font_02_sfnt_off00011222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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