Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f2371b00902feb…

MALICIOUS

PDF

80.5 KB Created: 2021-09-19 06:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 23c31c09b16c2aab5f8237812b91f0a0 SHA-1: 2350147fe059bee6088d43758199f5e45e405ed8 SHA-256: b4f2371b00902febf2078d3a4681f9dc73d9c15435baea914030f4fa2a343892
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=organic+reactions+pdf PDF link annotation
    • http://zhxndl.com/uploadfiles/files/gasukafuduti.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16146621628981---40418779160.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/33511691124.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/87016808971.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/60348346017.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131f4bfcc6ea---fifemaxodeke.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/bovatabaroteloxalekugikox.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/15275554848.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/80367212580.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/zuloverulijusokad.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcf36208d4---29861776446.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/39703467980.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/juxixonikekixu.pdfIn PDF document text
    • https://beautydent.hu/editor_up/vefuravufivosizujozenigom.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/guloravalofu.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/78726288803.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/69501080015.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/24314677561.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/mamakikebudiz.pdfIn PDF document text
    • http://tulga.ru/editor/files/68259716481.pdfIn PDF document text
    • http://wenxuezj.com/images/File/72633434371.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/81415387515.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/69022858612.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/7137759281.pdfIn PDF document text
    • 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_off0000d65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65D 17608 bytes
SHA-256: 2daedd5a2b6cdb83dd899646fb9eb11292f2fdcf709192bb3fed3a2267350b75
font_01_sfnt_off000103a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB8 10776 bytes
SHA-256: 5b17ef1a54b63d8650226aaa3d9334734f4b806f95899b97b5aa69d57881a69d

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