Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba59ad64097d2ff8…

MALICIOUS

PDF

69.6 KB Created: 2021-09-27 14:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 43199a00796b1351d61646f4821f9abe SHA-1: c87f04c7c4040de41b72461337e441b227245ea6 SHA-256: ba59ad64097d2ff8307a8efed458e5a5877290da271ba2a47b0ad51f3476cbc3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'SE_LOLBIN_RUN_COMMAND' also indicates suspicious command execution patterns within the document text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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://medvor.ru/uplcv?utm_term=hunter+x+hunter+ant+arc PDF link annotation
    • http://booklandbooks.com/userfiles/file/vobusarasipanisegi.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614248cc2fd68---24681803866.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/57328429371.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/9446514643.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/ratakoxakegenarewu.pdfIn PDF document text
    • https://jss-moms.si/upload/File/zujol.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/kumug.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd286b8479---vipokijigidomapo.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109110446188478.pdfIn PDF document text
    • http://baove247.org/upload/files/wugos.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/99781680618.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/vudojasozalalonajedumi.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091607475873499.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138001518310---91942214560.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/milugod.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/zivurujurupopi.pdfIn PDF document text
    • http://apple888.vn/luutru/files/71648831284.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/xalulatusivanaz.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/2175427274.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/dazotonejazurajusidun.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/6106903745.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/90648364949.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/zujowazagijime.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/sezufejemazakinadeze.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e68a8a3efa---fudemifazonipusuvawopeju.pdfIn PDF document text
    • http://rosesrealtyhoIn 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_off0000b447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB447 15084 bytes
SHA-256: 8d5cfd5b1de2cb9dedc75bad15d368afb9eaa3f3f60e250ae20f4d222b40d7c5
font_01_sfnt_off0000da4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4C 10096 bytes
SHA-256: f9492ab5ec835923cdc54fe2f090eaf3d654a703383730e12fd46d696ac899b9
font_02_sfnt_off0000f0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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