Malicious PDF — malware analysis report

Static analysis result for SHA-256 0de588fd1ce6b42c…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 09:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ad9ca3f227ad0da881c1fda734757637 SHA-1: abe152e4f560b2165e538e50885ae55813b51004 SHA-256: 0de588fd1ce6b42c64709129ba811067d95b7533215bd57c9f846cb324d3c178
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. These links likely serve as a lure to download further malicious content. The ML classifier strongly indicated maliciousness, and the presence of a link farm on compromised infrastructure suggests an attempt to obscure the ultimate destination of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/c66d8e74275e3468272ee49604d3853d/99755651963.pdf In PDF document text
    • http://ildongwire.com/userfiles/file/54479002057.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb74c4c2b0---9892110495.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/ef1e232893f2a13320efcb3a9ed0daa0/riwogabix.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/bupasupimuzigapalizatedit.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202108252228276770.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a80954aeb---jazelufikuku.pdfIn PDF document text
    • http://esistore.be/userfiles/file/34506592299.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cebfbbc1d5---49001169919.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa4f5dce56f---76777423778.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f05cd0001cf---jikanoguvuxobuvi.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/45625168062.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/firaw.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/jobonhbdh7akrg4upl1uoosp84/begamevisimajajoleso.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c219f7d53f9---fufate.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da60ff0664e---56657471892.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/buzigowitu.pdfIn PDF document text
    • http://mav-auto.ru/images/file/46688849754.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/vonusizoxivijevexipo.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/13756207880.pdfIn PDF document text
    • http://juentai.com/userfiles/files/vuwedikixam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=export+rdlc+report+to+pdf+programmatically+c%23PDF 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_off0000d87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF092 10892 bytes
SHA-256: 0c66de647ecc5f413333fc2fd67bc730b0d10a3dff051e8c8b70f94567e0f66a
font_02_sfnt_off00010996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10996 19564 bytes
SHA-256: 3fe5d087091494bb89cb7ef63e88717795a3031305cf08c941efd794fdc662bf

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