Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca8dfc8d76a4d4b3…

MALICIOUS

PDF

85.4 KB Created: 2021-09-05 06:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5e15696db21f48f3d19481aa3f46741b SHA-1: 877f2f21adf477860c61148a290f378b5b13e17b SHA-256: ca8dfc8d76a4d4b3465939e9a57c6ff26a5fbe975bff018c858857ef70b74a6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a PDF used to redirect users to malicious sites.

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 https://nomylo.ru/uplcv?utm_term=prova+de+fuzileiro+naval+2018+pdf PDF link annotation
    • https://eastmangroupllc.net/ckfinder/userfiles/files/14327943580.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607450bdcdad7---4289062909.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/bezowozazosu.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/38816013235.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083cd010000c---25955216187.pdfIn PDF document text
    • http://cga82.com/admin/File/wojogup.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee71c568155---xirosupilanelisixot.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/58f70c1c3827a8e91a4f08eca1b8a457/tilulopepidojasavimubu.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/tamevamaxofasador.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/30091280364.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/7e12bda301d4c2c03e80fe87df8f1665/jakesosakozozegabal.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/7748b2e11dc66f52d0115addb5ab99ff/92993114514.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/nopudatemedowev.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/dasejuxusebawamusav.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160746f22e1665---tufapo.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/abb230a019588a1c4e1e5d4e6de4e7c6/goworadepiwararemokami.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/3119710280.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c502f36dd40---firipeguvaxaluwewemiz.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/19616f552b2a191b4061d4d99b2298b3/tugigusufes.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7506c9db8---65882594369.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/zonojulup.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/82324382834.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/45071632972.pdfIn PDF document text
    • http://myredm.ru/uploads/file/jojijomovefezejaxolis.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/7a30be1e19c1719b3209f2c98c17c34d/11853927510.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_off0000e6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DF 10956 bytes
SHA-256: 50b1c25460dd4d30a53c858e1056bc6f86b0b1df735dfaac0f2b3e6f15cf952e
font_01_sfnt_off00010070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10070 18148 bytes
SHA-256: e2b633d4500ef805dc5176f06fb6b7975848f1a7fb50f4ccbaadd5576df7b1b9
font_02_sfnt_off00012ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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