Malicious PDF — malware analysis report

Static analysis result for SHA-256 a00716b42ac0a9da…

MALICIOUS

PDF

84.2 KB Created: 2021-09-02 16:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 93e5a9a80de125276d70fcb421a4472d SHA-1: 3c5dad2b50c9e277479a770345df04b94618bd27 SHA-256: a00716b42ac0a9da3461ec75517244573134a0d0fa91b518535bb883706dc660
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 platforms or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://philabc.ru/uplcv?utm_term=ppt+to+pdf+converter+python PDF link annotation
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160f01400eb293---39216806131.pdfIn PDF document text
    • http://bankerz.in/qpic/files/pupomegoja.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/tenovapeguduvifafe.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210721042212.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/budurufefetowexamo.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/26358808067.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/waxurakoxuxerudaw.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/26692823644.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/2fc28685dc4d45ee2123937497cc1d6c/waninanimukitedep.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16090789a806cd---55949511928.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/todamipewowekipukirezeme.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/31434203868.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/wepuwixogalu.pdfIn PDF document text
    • http://melinterior.ru/userfiles/files/45400188031.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/gizeraxivazikojupubu.pdfIn PDF document text
    • http://www.olivier-frey.ch/user/web/file/palizok.pdfIn PDF document text
    • https://sharenkon.com/files/neveganupobipabebe.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e54909eb5f---92178324637.pdfIn PDF document text
    • https://cerquilho.sp.gov.br/public/admin/globalarq/uploads/files/11688641646.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/b8536dab88e078c0e2a4441f539dcc29/nivekaled.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/61adca415787f7ed9a3577e7d2495998/72696482826.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/16817153680.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/653fcb76fa0772f057a49b3e55a5ec57/newowodupameforaburadoja.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/86648675692.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/35809904520.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_off0000e3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BC 18172 bytes
SHA-256: f6fd8d6507c73ad12b1e478f5ceccb5c735b9d944cf047e34e763021fa166f87
font_01_sfnt_off000112fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FA 10428 bytes
SHA-256: 3e1d4215b74615766659fe5970a5fd1be75f292f933b71b881b4e74fe64ce6b2
font_02_sfnt_off00012a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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