Malicious PDF — malware analysis report

Static analysis result for SHA-256 e839dd272b49064d…

MALICIOUS

PDF

83.4 KB Created: 2021-09-17 13:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 91e0a0938eb1750bd6a03581403fa550 SHA-1: 52720922be3330888478ec5d7985c5e61e4e87d6 SHA-256: e839dd272b49064d253e5008243687ad1385c761606be55b96f52ef57144d238
156 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 redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple external URIs and link farm heuristics supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ahl2005.com/ckfinder/userfiles/files/26598435061.pdf In PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/061820041041.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/3674897659.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/luzutem.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/wuvuvarogaxafobowaz.pdfIn PDF document text
    • http://potlista.com/file/files/kagesowofip.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/34582990725.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/zomilugen.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/mixuxafelabezunibexadiwox.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/lilenasopapazotiluk.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/13622768389.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/v5kahvml25rtnm3up49v1iv625/14746669527.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/wikesewubunadefa.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/64662985008.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/gilemepimedina.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/94845734331.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/96282457013.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/jaguwevopiwiwofaz.pdfIn PDF document text
    • http://fructusartis.com/i/File/gesijakakodenidenoki.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/95253281380.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ml5i3fkgatkouh63k4bcro2ub3/begiralefodepixireli.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/73694099576.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/zerokogu.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411a34e3c60---70332957415.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/nopuvunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=apa+7th+editionPDF 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_off0000e120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE120 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF932 18664 bytes
SHA-256: 12ceb029cbfceae9885dd82aaac68d3b8985070a1c5b741719bc0078f48781e3
font_02_sfnt_off00012977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12977 10204 bytes
SHA-256: 7f2b7fb8e58e3495defcb5a36d9c056186d23e87bea417a914b8ecd317582ab6

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