Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1d96751c8ac9fc7…

MALICIOUS

PDF

213.2 KB Created: 2021-06-28 07:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 550291042c0203596fdfdcf2e6bf6156 SHA-1: 44ef401776d76a0820fcdb08ce678750ac68a211 SHA-256: e1d96751c8ac9fc782b49d9c2699ecb20d3cdadc179a217f573291d4874fc2f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains multiple links pointing to compromised WordPress sites, identified by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external links suggests the document is designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9852

Heuristics 5

  • 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.
  • 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.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f0c133bef---61223579213.pdf In PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/lakejibiluxanowabujujet.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/51739025544.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210619_C0B6B8EB5ABBBA55.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/a12438404e53c9f52fae86f23cf9c264/femenunaw.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/47d26db9a00a91c709b81007d6c1fe7d/jikifekorutijuzalojus.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/ca0010a8ad30775cb553353b2555e682/63420182405.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/d9sbisrjob1nkv8ph598dotc35/62006824179.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18ce18532c---85903358681.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/64455649038.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb2f66b278---81089314393.pdfIn PDF document text
    • http://hncastlecable.com/d/files/nimunelububoburisit.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/b695c283414053134644e6d6ce050988/61205453886.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84d62f23eb---17234445719.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/59297742468.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94645a1112---91635159842.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f648cb7da5---1490491149.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6244ae4f17---gevizimasojewowa.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/folunu.pdfIn PDF document text
    • http://placc.info/up_image/19410373585.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/91232203037.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/68057758583.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/3vrd7alvb5sfmf785r12m7tjv6/niwevanatu.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/6e6f40e848518d9dd40074ebb1a9e00b/bupotomebijiruxumet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=law+and+order+svu+season+20+episode+19PDF 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_off0002e797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E797 17324 bytes
SHA-256: 212958e1eb825d37d3ef271de55702b55704ecb66658637bac80b9fd2417a3c9
font_01_sfnt_off000314cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x314CC 10912 bytes
SHA-256: a02623a18898ef83443ca7fd1e812bd9a9fefa4a4f24ef1798339a4afdd6bcf2
font_02_sfnt_off00032e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32E47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1