Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccc645905eb4f705…

MALICIOUS

PDF

98.4 KB Created: 2021-10-28 00:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fdb647230ec455344cc47ca3342857cf SHA-1: 231a81c47742aaad5cc99bee43ab6b247d6aac37 SHA-256: ccc645905eb4f7057a02d5483a39c13365bc0694bae09ab021c2ce730c053c43
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a link farm pointing to multiple compromised websites, suggesting an attempt to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://margheritango.it/userfiles/file/vugapawuvonuxexerogigijeb.pdf In PDF document text
    • http://huarui-bio.com/upload/files/kabuxek.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1616c04b10cad3---82024833256.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/binazobatatadilakuvabiw.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/pabedolujogev.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/lobiwamumuvemije.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff60eb8c16---19556566183.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/81412361793.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/99158809585.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/gudojunaxa.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/razijeperifujan.pdfIn PDF document text
    • http://gysanya.com/upload/file/210923060246932882r9cn8e7fc6n8.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/vidujebalinupisof.pdfIn PDF document text
    • http://xuanfe.com/uploads/FCKeditor/file/56664191185.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/7426959068.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210918193828_2011499722.pdfIn PDF document text
    • http://mopron.ru/upload/files/xesawofenokiripug.pdfIn PDF document text
    • http://xn--80aaa6aachkjln0qra.xn--p1ai/ckfinder/userfiles/files/finupapaxotenapaweragaf.pdfIn PDF document text
    • http://hingliltd.com/userfiles/pupusavenirunilubal.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/bokamoberikipolenidajegij.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/8fe4d37977f5d78ae087967acac69aa5/liroterukudowarijobakabe.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/D9plVHj2VOU/uplcv?utm_term=unblocked+games+for+school+wtfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000125af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AF 1780 bytes
SHA-256: cf43ea07d0e14c5dadc3c8d1a3fd6347ba51c91ab3c5d9ef8ee3d45ec84741db
font_02_sfnt_off00012e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E18 19480 bytes
SHA-256: 6d37b3ba9bff092ddd3b6087c394cc8f34678538f3108e5d7aac85f6d73dbf12
font_03_sfnt_off00016208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16208 11156 bytes
SHA-256: ca91fb70beb7e6a2f0bd4149a4ae200356d509fc02c85df50d768b566ec5e505

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