Malicious PDF — malware analysis report

Static analysis result for SHA-256 b82c893a499e720a…

MALICIOUS

PDF

96.7 KB Created: 2021-06-28 02:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9a2b8ef8984456ce3de2f9b52a64c2c1 SHA-1: 075bd6e33153a750f570011a8a0b44d3d565f55b SHA-256: b82c893a499e720a9a93e2b18aa236335c6c9aae2cb222c75f08b650d9683633
104 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised websites and disposable hosting. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs suggests an attempt to redirect the user to malicious content. The document body was unreadable, but the heuristics indicate a lure potentially related to account termination or urgent action.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://coretry.ru/uplcv?utm_term=necrotizing+skin+and+soft+tissue+infections PDF link annotation
    • http://caramelitos.sk/files/19858547050.pdfIn PDF document text
    • http://inistor.com/ufiles/files/supipevibejaxikire.pdfIn PDF document text
    • http://daydala.com/userfiles/file/89357585611.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/1914bc738e6f679cb9d11cb552efdcce/16004019786.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/af7981192fc79c6a3419553702f2f729/jaserog.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721c9d90dea---42501243467.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/9045022861.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7084fa38c6---punejukogera.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16096edf3cd62f---90413192851.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/xumepunowuki.pdfIn PDF document text
    • http://gibisch.info/files/files/58199527974.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/11552466863.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/2d4a1ea8def17af4b916da876d089a09/13842284974.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/d7d6bae86368fe110ef32334937fa99f/sawuno.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/nudelikamep.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/sufazureru.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccd7475d1c---19195628241.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083fae74ba06---narobudakexuboririketuju.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/75595308349.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/2a9hv9jdgr2qfkv20hs5u515u6/xezina.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160bfccb60ab86---65428633576.pdfIn PDF document text
    • https://webmenuplus.com/images/file/rolagurunodona.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609681e087d9d---84919110476.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/f86803fa820c8774d91f3e5ea83b471d/venun.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11616 17532 bytes
SHA-256: 84dcc0a03c0f1c228ff0920cee4d868e881fe9998a3e7f9f30e6a0d7aae7a659
font_01_sfnt_off00014439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14439 10836 bytes
SHA-256: 1867865f9d11f8bc944bb42ca3b6c89368a52043fef2917450fc75fcfe5c0fbe
font_02_sfnt_off00015d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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