Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b95fbdfa5c23d74…

MALICIOUS

PDF

90.9 KB Created: 2021-07-14 03:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94fd3d4dae3667405fc8a62f56e0036d SHA-1: aa7345625f98c1400b824a4548f9a3385ed92171 SHA-256: 9b95fbdfa5c23d7470856d6131dfafb90a36e8372c51e1f1e17db487f49f5002
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns suggest it's designed to lure users into clicking links that lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b6481fa5d18---11755044995.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/73d595db34c1237e92fb4565540f4232/75823238761.pdf
    • https://polandpools.com/contents//files/57257724360.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/3b49d97e0e03c31a549838f6ff539741/11922147288.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d67eb6c8a9a---22521927206.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bbed41e16---rafifujuju.pdf
    • http://creaorganization.com/depo/sayfaresim/file/mositisul.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/690ef6f3aba103e212a0ba97ba00eefa/wuxisorawidugenadutanu.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6f1869616---vosej.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736275c1bd8---53210849376.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b4158c4f8---28758751452.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/s9ujivn6ctlmjko582tmd3jdn5/85762936786.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160812a0e05484---pokurepetape.pdf
    • https://vinacomvietnam.vn/uploads/news_file/nizoxizenowajuvuri.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16074460fd5ecd---lojalasaxojemilonalotubi.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/ksjech7gbf0sqothrpijtrde6d/65093663986.pdf
    • http://cn-junsheng.com/upload/file///202161365567005.pdf
    • http://ahkjt.com/upfile/file/5134106375.pdf
    • http://ues-rb.ru/themes/ues-rb.ru/files/jabezokezas.pdf
    • http://hgbs.de/userfiles/file/vivosuzuvozuxadesoguv.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8d649dc25---xekonobutaru.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42d23633b9---kedup.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=cambodian+for+beginners+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff9b.bin
70a067eef00b1f8c6da4c979d94353404948715be7b8488e8ff32ad7f20526cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9B 17032 bytes
font_01_sfnt_off00012c32.bin
41268e42fac1824ee6733b1d912ac5df14cd3c3769f03aaa544da00baed829c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C32 10868 bytes
font_02_sfnt_off000144d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x144D4 16792 bytes