Malicious PDF — malware analysis report

Static analysis result for SHA-256 0caf1b21b9ff33ac…

MALICIOUS

PDF

80.7 KB Created: 2021-10-07 03:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: df3c16bb27b900d5403c77fab2db031d SHA-1: 0bf9c89ca9572e21cc437e1d9181065939568f45 SHA-256: 0caf1b21b9ff33ace6d074acde3feb60b569ababbe318ebfcd9242fb9e1d4fc5
196 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://allytemp.ru/uplcv?utm_term=best+pvp+talents+for+resto+druid PDF link annotation
    • http://stroisvias.ru/userfiles/file/62479905130.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/31664107823.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/11343215492.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/sobexowobo.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/mufefevimod.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/fikitimeradupenavavoga.pdfIn macro / runtime command snippet
    • https://jiu-hang.com/upfiles/editor/files/noriretiwo.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/xojixobexuwurezufev.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/diteno.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/laneserejigi.pdfIn PDF document text
    • https://firstview.christoff-design.com/files/47528294481.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/gifosa.pdfIn PDF document text
    • http://agilesolutions.in/uploads/xapukimetaxuli.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613177bc26566---xanamesu.pdfIn PDF document text
    • http://citlak.com/admin/UserFiles/file/lolarejamumerukeze.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/89215708091.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/86c6141dbf4591f5ea03cdc59dbd6c6e/54482701263.pdfIn PDF document text
    • http://nanoservice.sk/upload/file/guxam.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/xonunadadenepumuwezex.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5975cdbc9---mabezutugigizojimonuwapib.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/lovaxoko.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/muwinadasarumel.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/41455890769.pdfIn PDF document text
    • https://doucetplasticsurIn macro / runtime command snippet
    • 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_off0000d10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10B 19276 bytes
SHA-256: 8c2bd575070ef694fa183c64a36e7a5e7660f6a779e2730fc40ad0fd4dfc7f1f
font_01_sfnt_off000102f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0A 10708 bytes
SHA-256: cd6815ddf57c0c002dd840718f6b317e24392feaf0e85c4ba913a6c5c7f6ba9f

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