Malicious PDF — malware analysis report

Static analysis result for SHA-256 49084de5aa3daa4e…

MALICIOUS

PDF

83.1 KB Created: 2021-09-12 14:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 90f8476cdc0b05ef2bc318c5885a358e SHA-1: ca3ea8ff5e72f96cc2fdb12d35decf9b309f5485 SHA-256: 49084de5aa3daa4e7d449f8a41b825781ba5093952d00e2e7ec9daec2e1fab0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external PDF files, many hosted on domains flagged as potentially compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the structure suggests it could be used to host or redirect to malicious content, potentially leveraging embedded JavaScript for exploitation.

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 http://triple-a.co.th/ckfinder/userfiles/files/wirip.pdf In PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/79899520233.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zijetusanumasidakiduxuwi.pdfIn PDF document text
    • http://starma.pl/files/file/64318771662.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad56d22835---rufafududererejokedor.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/56264838499.pdfIn PDF document text
    • https://12shio1.com/contents/files/76333071589.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/25328239588.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/pabugimusutenik.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/lk54hgi1vlva65kf7s2ckj36cl/tajebowonewikawuzazen.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/wewilixibozusofifatono.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161310eb99e7ff---13013627498.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/38009447538.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/68553918945.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/75452687400.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/wamepuxo.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/28200805298.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/5174cf39e48adb35322b476b63df6b84/malovumuxakijan.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/xurinikogorobo.pdfIn PDF document text
    • https://serka.com/serka/upload/files/rugiwejel.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/zuxulijeluni.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/vifirane.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/5800158327.pdfIn PDF document text
    • http://video-cycling.de/files/file/dekepuborovakomiboba.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/34095811652.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=jomonte+suvisheshangal+movie+download+utorrentPDF 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_off0000df45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75C 10936 bytes
SHA-256: fdae71f9743aad1c5db317f250ddc101b1a6c974eda72803f2330602e35a43cd
font_02_sfnt_off00011059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11059 17504 bytes
SHA-256: 205a4bcaead4de78794f16084178352128fe87493d91f873d99adf8225f0e324

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