Malicious PDF — malware analysis report

Static analysis result for SHA-256 e741c07ed27cad03…

MALICIOUS

PDF

74.1 KB Created: 2021-09-06 08:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7db19fa1d10355866fb8fec46c3e87da SHA-1: b0dfbb1ebca283fcb63a539fa44dbcc9c25d7459 SHA-256: e741c07ed27cad03aba1fff6cc1bf9309f85c4cbb8f37576be54b8854e7f5549
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving spearphishing attachments, where the PDF serves as a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=aprender+a+leer+para+ni%C3%B1os+pdf PDF link annotation
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/c6dd151c6d0a4250be3fa7e101fee2dd/24746746253.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/burofifemowujeme.pdfIn PDF document text
    • https://agrando.cz/files/file/wekugoxelumewu.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/gegokugunabiv.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/vimitegamubev.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/91132153912.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-6-25/20210625194854500731.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/95579527240.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/90313281074.pdfIn PDF document text
    • http://zubrcup.by/files/files/30775692751.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/398f10a95422094694ccf70ba4746779/96897671047.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609779518bf4c---pujeselilurimuxugoru.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/sizebomuke.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/69378426450.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160845fbe16133---xiloviwukamarul.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/21245907982.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/55110965029.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021062315452917.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/ff169a2e9d5d4e0ff375054c0011e61b/78602780731.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cde9ca31b29---femaxirosamemobel.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160eca95034d67---sesasepatabinakifigig.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_off0000bf67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF67 17028 bytes
SHA-256: c08565961d8b57541e2568b495f6e74276219a1e8646b3c226859e9016e51aa4
font_01_sfnt_off0000e8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10114 10580 bytes
SHA-256: e343098d6fd77efef088820da9a236e7b1f1be73841fdab7af3cee2fec0a0726

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