Malicious PDF — malware analysis report

Static analysis result for SHA-256 e695852f2fae069e…

MALICIOUS

PDF

82.0 KB Created: 2021-10-11 03:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 7c82eba10146eb8fbd09ef02f6017fd9 SHA-1: 8f41bfd13513bca9077c9328a7d3cb59fe18c304 SHA-256: e695852f2fae069ee3d7c3463702b8a51780069f80a5e43876c8420fd549afa4
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. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=excessive+burping+and+stomach+pain PDF link annotation
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/jkjgnok5ulb8cca501el8tourm/49857559644.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f3c768721c---tivemuku.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/kadazuse.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/fafetarojevatelidukaf.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210929_015330.pdfIn PDF document text
    • http://istruttorecinofilo.it/userfiles/file/kirurorotereviximadet.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/refetelonovenikijum.pdfIn PDF document text
    • http://santeh.md/img/files/savibivinimoz.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/wusefu.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/pakofulin.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/lagukexitaniginubisofifu.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/radamugesojowivabe.pdfIn PDF document text
    • https://eetravel.net/file/68427099067.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/pamixizifirubom.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/c0a74511f34369345d32156f3768d149/64692593339.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/zuvebomazenizagakukevi.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/dubotogemoxug.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/70287250258.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/jilokupogom.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/duragodobo.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210916104749.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/xagivig.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/kepumifigodonibuwibofiwiw.pdfIn PDF document text
    • https://miet.hu/kepek/14462789427.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/16908302544.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_off0000d8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BC 18224 bytes
SHA-256: 4b06b72bc1cfda2a03d36182967fa8808de27413c18cd81b5f1ee403f93b0ccf
font_01_sfnt_off0001081b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081B 11304 bytes
SHA-256: c615baf487981a657e7e5291861fee087e451c13c86cbb8dc770d845a677e461
font_02_sfnt_off00012225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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