Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad4e5c6261803d6…

MALICIOUS

PDF

80.6 KB Created: 2021-09-12 17:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b5ab40c987e38c24e8eb83a716f44625 SHA-1: 99d57ae7300002c48d919d0b2301bfea2494f293 SHA-256: cad4e5c6261803d6e53c1e5ca56f1962d9267e2bb16c5e8e500dc95d0abb7c06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards an attack pattern involving redirection to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://mellorymotors.ru/admin/ckfinder/userfiles/files/kugubunekizadup.pdf In PDF document text
    • http://elfuklid.cz/foto/Image/file/givovaloka.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/tulapolufamajanizurik.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/wulaxetawufikejil.pdfIn PDF document text
    • http://ge-mak.com/files/nemevoponilivosezogatil.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/67284316211.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/5855305418.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/16025478082.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210910114931.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/81899754642.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/genekezusud.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/warenuravile.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/miwipo.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/wakezavebodinutolab.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/69771655081.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/99184607944.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/ketidoz.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/2a108b6bfeeb2f65bb0ecec21d052ee0/25723505780.pdfIn PDF document text
    • http://dusunceokulu.net/resimler/files/vuxomodiraj.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/75035126428.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613022f365886---rivepogipobelum.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e593d26c4---vigofafefalokugipubav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+do+i+reset+my+androidPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/jawenuju.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_off0000d5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFB 18192 bytes
SHA-256: 25ee40bf485071772f7177b76a16970835d04a78e9f55364b83232fb88858e03
font_02_sfnt_off00011d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D35 10552 bytes
SHA-256: b61dd9d6a71faea47c4db450ed917193830cc23a09806f4a733f23eca05dd357

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