Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ed9d1cceb9edfd2…

MALICIOUS

PDF

79.7 KB Created: 2021-09-03 19:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8830a04a98ce6abdb9aabd6eb06aa995 SHA-1: 55d027dba3610e058fb8a33d77040400f72c3e76 SHA-256: 3ed9d1cceb9edfd221a692ab84198cf53f622c8db9a438afcfb6d86701f49e95
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The heuristics indicate the PDF acts as a link farm, directing users to compromised websites and potentially disposable hosting, suggesting an attempt to distribute malware or phish for information. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://irlanc.ru/uplcv?utm_term=scholastic+sight+word+readers+pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16114f213595c2---25483346394.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/3b1533537987daa0fc3d7438179aa7d9/fenodixalamogi.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ed51dbb4844---42286483489.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/2b04240604317f696ecf2b9497ae086b/mulasoweximitivifazo.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16099f10b683f6---59751395924.pdf
    • http://varadimasszazs.hu/uploads/files/96519250674.pdf
    • http://poultech.net/d/files/9137936125.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaea06ae15---niwejerumi.pdf
    • http://mundori.com/js/ckfinder/userfiles/files/89614074514.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1611bcd312352a---18237666608.pdf
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/50951187669.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f8b3cb64baf---bolinavixomiti.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098660a00f2a---jezofug.pdf
    • http://reutlinger.pl/userfiles/file/volijavoragegufarigivoje.pdf
    • https://maxflowfans.com/userfiles/file/gosav.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/47b26a3a7d089e749026c1bbd8cf5a00/79865330767.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e04a280a4---11190396109.pdf
    • https://geneticapanama.com/userfiles/file/25355088328.pdf
    • http://franzoesischebulldoggen.eu/userfiles/file/45725967028.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/sbcbstv3cgg6fg1qaec260guc5/mogivudituka.pdf
    • http://hc6999.com/userfiles/files/28574833420.pdf
    • http://studiosimonepantaleo.it/userfiles/files/96614519674.pdf
    • https://tw-itemaos.com/ckfinder/userfiles/files/20762011664.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/bddb8af93926dce5f9487e0285f55cdc/55493873340.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_off0000d0da.bin
4f0150fe7a6f72355b7683d63e8a270ae6c91d5e4742c6d5036f0befa32972c1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DA 18072 bytes
font_01_sfnt_off0000ffc9.bin
fcd63f836b543c7524e68876a5514e8bed3aca2b207e12abf15e8c82a6b705c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC9 10956 bytes
font_02_sfnt_off00011938.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11938 16792 bytes