Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbfa098435c390b9…

MALICIOUS

PDF

69.3 KB Created: 2021-09-17 11:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 994d621648b60bd50a8915f6dd971873 SHA-1: 3cb7f34cef9d29d3553979368e049bbebf10ae19 SHA-256: bbfa098435c390b98493362130fe169c4c1affbf699b26f92e13bc445f548f47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple external links is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://catamma.ru/uplcv?utm_term=after+we+collided+full+movie+stream+free PDF link annotation
    • http://se-ty.ru/uploads/userfiles/file/lebuz.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/76871388133.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134542bdfa9b---tizewugumir.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161420899f31fd---murenilegelibetuju.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/futagipugalugite.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/maparifikuw.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/kafibifedenegopu.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/59908813816.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/duligesexelejosetuger.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/rrutjf9d84jos1rrrlfp5bg395/84637563484.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/6efd6c4870b084b2b0b5df8a3628f03a/sabalusopogizegoruba.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/171029ea85a707bb8cb3d2b65ea0dbd4/nepekaze.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/rupoxuxu.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381855a7744---kikepa.pdfIn PDF document text
    • https://tckontrola.hr/files/25947027129.pdfIn PDF document text
    • http://licausi.it/userfiles/files/95912659361.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/57189904275.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/gujoruzepomoziwax.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/82140466521.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/39702196158.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/jemilazezev.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613871b7b8512---13582383642.pdfIn PDF document text
    • http://harlit.com/upfiles/file/13476909660In 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_off0000afd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E4 15400 bytes
SHA-256: 046f8675a48debe1e0f94c1fe2d19dd0e01269c13fa2d9ee583b8c5aab41c958
font_02_sfnt_off0000ef05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF05 10768 bytes
SHA-256: 8e855e9283a1c92e14b898aefa1d295505a14337d887d7a0b52b6d12ea9d1d21

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