Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a403f2ac2f7ba65…

MALICIOUS

PDF

78.3 KB Created: 2021-09-19 14:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 667f8b4c3ef70f5de542a92bd1faf95f SHA-1: 8d12ebbf203cb85675f8fef943faff99b61f7413 SHA-256: 1a403f2ac2f7ba65cb08d025ae9c52d0f7db90906e8527a94b2aef073e0bc406
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://dotbamboo.com/file_media/file_image/file/tedofekenel.pdf In PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/wopuvotivedimu.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/lireboran.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/54064818139.pdfIn PDF document text
    • https://curvy.tw/upload/files/24557141766.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/dujebenonaro.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/95474886986.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/51918759313.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134353d7064c---vosapukoworojaloniwiti.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/93969296931.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/bukalurewadegifuba.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/4045bc462a10c2bf7881f295e5044322/99137816726.pdfIn PDF document text
    • https://duvanco.be/docs/files/kelipunenexusuxusunuketof.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/42241139603.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/1923723536.pdfIn PDF document text
    • https://recrut.com/files/files/37898375632.pdfIn PDF document text
    • http://dsfly.com/uploads/files/noporukafem.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/gukejeg.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/rexixizaguleki.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/89865358908.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/wuloxasorevoz.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/76799670375.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/499583f084a031600d739f22371d2d2b/74110079458.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/purifewusuno.pdfIn PDF document text
    • http://creationart.hu/files/file/fofopuluzivi.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/runalo.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/kamotaneleripadijumuwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=yify+tv+appPDF 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_off0000d23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23C 16836 bytes
SHA-256: aeec2ee9d3e94931c0cdfd014062406cf445044a9628b8bebd795e6a2eda20c0
font_01_sfnt_off0000fd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7F 9844 bytes
SHA-256: c6433ecd5d0418309ed96fe2ae58ff9adf24c70f4bb8e82920f94648fc32f46d
font_02_sfnt_off00011341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11341 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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