Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8045fd6b488c52…

MALICIOUS

PDF

71.2 KB Created: 2021-09-05 04:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a70d136d5711765ef2bc522ba554ee9f SHA-1: 877836b4a100283ee736d907d470ffc88486b963 SHA-256: 0b8045fd6b488c52dd0270f431d459bfaf27cac8b1578fb6b2ae6695fc345b72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16126eb2f20214---21709806412.pdf In PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/251n3i0gkm57nfutj7lhpvstgv/robudozuwawamepikomewop.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///19174839605.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/45164703914.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/38826016419.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/xiribulutiw.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/batikeditivutokez.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27c0b8d5c7---15092402096.pdfIn PDF document text
    • https://computerzone.pk/file/3382507545.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/xerotum.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/78188726894.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/0f91463bf1b558f5bde76e50512966f9/pesevovizanorulafunesa.pdfIn PDF document text
    • http://funperm.ru/content/file/xasozuvajexubud.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c912f554de---79171497593.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/gajuzelakepuvezeji.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021063014581073499.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/77023191353.pdfIn PDF document text
    • http://chhsclassof70.com/clients/1/1f/1f6d1b94cf555b90b9f410dfa82aea5f/File/fapaxumukovefogalafor.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/weraworavora.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/dudatel.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/c2fd25fab0e062e69ac30d5c9bc26fba/fafegemuf.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/49c2b3ebbbfe66b6d5ec5b32090fe3c8/guxajilenafinelizaji.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/wezowa.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16076e07574821---wurexotakixerajusumawafa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=write+into+pdf+documentPDF 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_off0000b2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DC 17696 bytes
SHA-256: a558fa43b2694d7e52deb7f38fce198cac4fc4cbb31d71cf02ac444f302c06f1
font_01_sfnt_off0000dfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC3 10496 bytes
SHA-256: 3d0b67b16a2256a6d258c48c4903bcb72f39b52ea2144fa50ef4901969c70902
font_02_sfnt_off0000f79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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