Malicious PDF — malware analysis report

Static analysis result for SHA-256 19f603f8ddd2da5b…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 08:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3df22206d6a129167539349381e55859 SHA-1: cfb60660063f62f1bc6124d61386886a44abcba3 SHA-256: 19f603f8ddd2da5b91bc37e387f3d2ce7def4d93c47138034e8468aad7256d42
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the URL patterns and heuristic firings are sufficient to infer a malicious link distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143f3d54a1fa---niluguvuliwenuvurux.pdf In PDF document text
    • http://turnyras.lt/Files/file/futujagulepinuzapan.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/xulomukumatosebemewir.pdfIn PDF document text
    • http://methese.com/upload/files/vusoru.pdfIn PDF document text
    • http://metapolar.hu/tmp/22196357357.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/lozironobokomedixezafeli.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/23210814335.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/49018468082.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/tn1aiagtsi47nr334ujos6eil9/rizurogiranokipekevevux.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/46501084753.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/9368cad14400a63294f12a4347639c1b/puvosur.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/55914066805.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/36798618446.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/wujowukexejafonemabegibu.pdfIn PDF document text
    • https://ons-station.com/editor_upload/file/98774542307.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/kokibirojodufopibotased.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/16340126715.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109131923013743.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021090112351273499.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/xefebed.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139aa59a1621---mevinabo.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/mawojezotomukibemasafun.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/e0459c375415d402445fe3d00d0bb531/lutexupapotoxitewojezosig.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbf9ac821c---petibugatuwodexefotagune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+do+i+copy+and+paste+on+an+android+phonePDF 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_off0000d613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD613 10756 bytes
SHA-256: 49b3e713ad3f78684a7c5917e2749a5c5d84a09f48c0df6b26b17093f1ae174f
font_01_sfnt_off0000eece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECE 18080 bytes
SHA-256: c04299f14074281a1cf2557c161d0280fea33a559df5206a2cc9d517a27a7e59
font_02_sfnt_off00011d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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