Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc9281b5fb126e39…

MALICIOUS

PDF

76.4 KB Created: 2021-09-29 01:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 00a7642f01c0c1f29dc07a47e8176c11 SHA-1: 23e2d56bdc6f0d06c29734a7b1181fe433dcbde0 SHA-256: fc9281b5fb126e39bcbc4da0c77b1d8817fc3e5703f4e4e9ccb9a3c0caf29ee8
196 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of a 'LOLBin token sequence' in the document text further supports the execution of commands or scripts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://path.mn/userfiles/files/kogon.pdf In PDF document text
    • http://domuran.pl/files/file/77603262163.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/84640228040.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16151b71404831---30729909276.pdfIn PDF document text
    • http://gazetavk.ru/img/file/87519416380.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/51573696058.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134df142a245---8519335287.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/rujugixode.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373917c4468---27980152927.pdfIn PDF document text
    • http://benrassam.com/uploads/files/kovelidewutonifopug.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/lopiwinubiwuk.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/27972484143.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/53298225320.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/67358455352.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161519e3911dfb---jelok.pdfIn PDF document text
    • https://alutat.com/data/file/27061189363.pdfIn macro / runtime command snippet
    • http://arredamentoambienti.it/img/file/rezijikamomulajosuzotesa.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/52276604685.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/vudovoriwoxoremimided.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/78185426740.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/21815262705.pdfIn PDF document text
    • https://talaa-obour.net/webmisr/uploadwebmisr/file/vafuv.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/67801436092.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a54ee1533ed5d89947747d753eee3b53/xetexokasavanubatewogaj.pdfIn PDF document text
    • http://www.sbawerribeeIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=demon+slayer+free+online+streamingPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB311 15776 bytes
SHA-256: 5a6b0909368efda084422e637a8481c59645f910fe48cf07fe3a1b9907d978c9
font_01_sfnt_off0000dae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE4 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_02_sfnt_off0000f0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BE 10672 bytes
SHA-256: 4851188acb65697616b19e30504343d576209a9e79db002b5a9d595df5b72172
font_03_sfnt_off0001093a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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