Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db4418610a00c0f…

MALICIOUS

PDF

94.0 KB Created: 2021-08-22 00:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: f121fec9237b1f487b8c7f088c284e61 SHA-1: 5c8de040d88894c791789a77ae521b07cdaafe31 SHA-256: 1db4418610a00c0f2e62500a4d4007dd5fa528337019f646ee7975b95aee3ef4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://huntic.ru/uplcv?utm_term=what+is+the+concept+of+parallel+universe PDF link annotation
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607439dd7fdd3---jokepemixewixerepoz.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/f5525609c6706e476dacd3cbf7a306d9/31228969245.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/ovd2vbhp9ubl5apqor6osejnk3/jafovuderilenaxebagarof.pdfIn PDF document text
    • http://gtshotel.it/images/file/39673769093.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/janitekozaxusebu.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/16449371524.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/27546090165.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/karadedutatowulijedav.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/81962022036.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210626_523C0358A4C41817.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/55642589173.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c300a363a---21247627322.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/gq37v9sd7o16sk2rpmcimvh0p1/rarogofirosoderidolilalo.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/gugimexolonagaxiraje.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/nubatesuvodekiduwa.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/bokaridejij.pdfIn PDF document text
    • http://labonscafe.com/userfiles/zutelerexisedijapebax.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1536b1cc4---6237044808.pdfIn PDF document text
    • http://koala-al.com/d/files/9474186422.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/10765521954.pdfIn PDF document text
    • https://sharenkon.com/files/jobogigupogawipomojobisel.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a688903b360---vofasetagilodevixagi.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_off00010d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0E 16968 bytes
SHA-256: e10db1df7d6da7a15b8a584c10317715c58ec8fa9ab069930a43190f29fba3c9
font_01_sfnt_off0001388c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1388C 10736 bytes
SHA-256: 4b99d531be591d0227079316a6ae320a25a53eaffc8407453bb7d232e7405c0b
font_02_sfnt_off00015135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15135 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1