Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9634ce6ff18420…

MALICIOUS

PDF

80.2 KB Created: 2021-09-12 14:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e9f105ba0e55cf85ef79093ec6be9041 SHA-1: 1e7a4b7b5550de0d271fdb17ddf73661a48fbde6 SHA-256: 5f9634ce6ff184200ed935d18ea1c92c7c57986629a380ab1ec42c665d064f52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to potentially compromised WordPress sites and disposable hosting, indicative of a link farm used for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chono.mn/uploads/userfiles/files/wigufubogu.pdf In PDF document text
    • https://baglab.pl/galeria/file/45114826150.pdfIn PDF document text
    • http://skupka54.ru/upload/m/96531474474.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aca2b8b67e.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/ccd82c6542c51418f8300996ffa88328/kuzudirilarapuwo.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/5685717377.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/piguz.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/vonavuvukosexijoxa.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf94cee38c---fufivopufugogitosawujulem.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/litaluzav.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/kejowunudiwezuvelekovafa.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/wurabawogavewenufusuxaf.pdfIn PDF document text
    • http://uchid.com/uploads/file/pisikuz.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/liginozinuxateti.pdfIn PDF document text
    • https://bselink.com/userfiles/file/nikudanan.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/99961987411.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/foxepedapijezuwakugeni.pdfIn PDF document text
    • http://seamacros.com/upload/file/75656536952.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/wogujul.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/7611521603.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/27743562159.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/samofiwavabodewofobita.pdfIn PDF document text
    • http://zonwering-belgie.nl/ckfinder/userfiles/files/tobuzosotevujab.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/rumanalilikixukubenesuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=steelseries+stratus+xl+android+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_off0000d40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC21 10664 bytes
SHA-256: 5b3dc0e391ca78ec11e1b6aa37ebfaf39f00c92f5941837b079e0498d9a77ac3
font_02_sfnt_off000104a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A4 17964 bytes
SHA-256: a233bcaf9180bb0989eed3ff2045ea68e0008883f30238653d05b2058faa8897

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