Malicious PDF — malware analysis report

Static analysis result for SHA-256 87be4f82e1cf4fa9…

MALICIOUS

PDF

86.7 KB Created: 2021-09-02 13:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9cb98ceb21cb85007e4cd0b0a932133f SHA-1: df795d447b4be5a39867f0dd255053318ea96ef2 SHA-256: 87be4f82e1cf4fa9d65de231ea065a1bc9ad33bd003eea3c8769058dc5f1984b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm that points to multiple compromised CMS uploads and disposable hosting sites, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the presence of numerous external links and the overall structure strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d0ba926d7---47671727444.pdf In PDF document text
    • http://hoshitorionline.com/uploads/files/balurikumikegij.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0d1b4e813---nigin.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/3400d4518967b56c894374757e55b7f7/59662706309.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c7a19cd564ceb57f4d428fe60c0d9084/korapowujejefug.pdfIn PDF document text
    • http://thefjordbaklawfirm.com/clients/876731/File/42356626425.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3341b7412---sivabovibafimutuful.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/xemuxutipajufiwexit.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/53897003825.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/85803784556.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081fc49296f8---29295694364.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1612dde6dd5b74---gogevekajupozo.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210815_3D439992459AE1BE.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/dizatuvunonazemujubipin.pdfIn PDF document text
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/57277756290.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf2487d57a---rikofiwanimepodametefe.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/33695637224.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/bbbce29f5fe4eee6d1a044b25f578801/1679723017.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160949ee3400c1---foraxevanarel.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/29580595544.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/luxesaxatemijuwepo.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/pubabe.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-29/20210429125109762964.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/usr0jdr8pgcel24s2c2slfv647/zimiwizisonupiwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=gta+san+andreas+cheats+free+download+pdfPDF 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_off0000ee30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE30 17608 bytes
SHA-256: c785fbd9dbf03e763ed8a7194c46e0e4178d914a21ca2d5f947da0ebf2482154
font_01_sfnt_off00011c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C45 10748 bytes
SHA-256: a914c41ffc7fe291a1475e67fd43cb8c0f840068fc3aba6654079ad004b9a701
font_02_sfnt_off0001350a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1350A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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