Malicious PDF — malware analysis report

Static analysis result for SHA-256 f543a84b60d487e5…

MALICIOUS

PDF

98.5 KB Created: 2021-07-21 15:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a7ce7ae76e87eb29ae18da227f2591cf SHA-1: 9cf94eb596946ff080541c70e153d97d587cd117 SHA-256: f543a84b60d487e5ae18c5a9ae3ac0e498571f06837e954bc8d6d8b48ec61de2
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on domains flagged as link farms or potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9739

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://project-st.ru/userfiles/file/puxunedijutafanawolu.pdf In PDF document text
    • http://ahsaipu.com/v15/Upload/file/20215112156406930.pdfIn PDF document text
    • http://slippersymposium.com/clients/875641/File/67808700144.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/sujasib.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/pejinukiluzixeriduvure.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/44474372829.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac48bc21f39---tures.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/b7d2ed236539ec14791124fb5de2a297/pepuladupunozitonirasi.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/punuzofin.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/gagiwu.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be9eb4d834b---68564098002.pdfIn PDF document text
    • http://merwepizza.com/upload/file/zuvowizog.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a069db5745---lidikijifelo.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3542e70094---4394650201.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/81034574432.pdfIn PDF document text
    • http://ahchala.com/img/file/46432027093.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba5a6f7a3---labotupobixokaxedide.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8a566d422---zudexusazidedot.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/4c54d4fee2ff542ddc3be9e2c2c7cea9/92615834319.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/kerurenutewutu.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/tazonuxuxuzivebeleko.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/166dc2764e317711bf8f7e7869c153a4/perogazebagagaveg.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/39336039504.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/dupejobiwedanoribafuzuvuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=hachured+lines+definitionPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000e01d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE01D 18172 bytes
SHA-256: 90dca8db235cdd87f4c17da87dd378468fe32dc0442e450b02011d3a7c6ead63
font_01_sfnt_off0000fd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2D 24960 bytes
SHA-256: d06f43f33acd348df4dd133c9471786cd026a6d5db59276f7ccf978e43b01a07
font_02_sfnt_off00013b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001531b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1531B 3924 bytes
SHA-256: 4ee5b7f32d30257362b02a1ab52c570dfe57418fe9777ae3d94c8c1fb9860979
font_04_sfnt_off00016209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16209 10664 bytes
SHA-256: 3bcd2e8c537f911ccd6d8f07773d43f76cc196012ea97f258c961f6e32c9eded

Open this report in the interactive analyzer, or submit your own file for analysis.