Malicious PDF — malware analysis report

Static analysis result for SHA-256 e76a0fb181aba99e…

MALICIOUS

PDF

74.2 KB Created: 2021-09-13 07:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 156026a571d51ac2e9336c9061e8707f SHA-1: d67bed3d0c20e975a39be381c8069073e849da8f SHA-256: e76a0fb181aba99e971c3787c3dd9a90b9781a9844bad386e7df6dcbd6e9191e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised CMS upload storage, suggesting a phishing or malware distribution lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the presence of multiple unknown URLs indicate an attempt to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://florerialafloresta.com/ckfinder/userfiles/files/21044239497.pdf In PDF document text
    • https://bamfieldrental.com/userfiles/file/xapoxedafajiri.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/83401071943.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/94297535533.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/bakofozagoj.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/soxedasale.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/615991499.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/31259989016.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/lufedif.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/50421713125.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/59788233351.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345230ab7a9---12182849179.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a74e614a17---52258967991.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/28512863999.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/zagujasen.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/waxujitafisanigopiro.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/nogexonepuve.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/laxagefob.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/lijofudekalagi.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/gobaladunujarijinidotak.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/65973499227.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/gipusuzulamijopukini.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/vugul.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130608968f01---fewotalajojoguxomabije.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=dr+driving+game+download+hackPDF 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_off0000bf01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF01 16840 bytes
SHA-256: 1ad25490a7a45ee1789e5a99667e2bf18929048f370243e1e364aabff6d2004f
font_01_sfnt_off0000ea97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA97 10796 bytes
SHA-256: d4b9e0d70cb91402236537412527fe372341989ee142c1d9a2c43a2f3a058a2d
font_02_sfnt_off0001030d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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