Malicious PDF — malware analysis report

Static analysis result for SHA-256 8357928bac031c87…

MALICIOUS

PDF

88.5 KB Created: 2021-07-26 09:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 95a22600710e41167a88b3cfd04152d9 SHA-1: f362cdb0db709cdfd6644499086c869eb9eecfb6 SHA-256: 8357928bac031c87a860d45b7eabcae0e96507c6fda073d297bb4336f72f47ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable hosting and compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://tectrongim.com/uploads/files/sifuwojafupibipini.pdf In PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075d3875a552---80616907926.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51e6480091---fodadevotel.pdfIn PDF document text
    • http://cocoal.com/uploads/file/rukusuga.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc2151e81f---41656366860.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/50986009442.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/dewonekugelitad.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/gagoxuvedav.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/66439927794.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f31ea559c84---32667686698.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/govemisoni.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/jemimuki.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c66768fac---5037690564.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dc17e0ba360---rasazebafiz.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/litukimazisupujopivezoxoz.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/navaxaxomijeren.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/samil.pdfIn PDF document text
    • http://udemadriatic.com/userfiles/files/63221529854.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beca15f2ca2---15824888982.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/48390674446.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/sadujadenukevozotawebam.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/defoxekezanomiw.pdfIn PDF document text
    • https://m���AuthorIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=9.s%C4%B1n%C4%B1f+denklem+ve+e%C5%9Fitsizlikler+ile+ilgili+%C3%A7%C3%B6z%C3%BCml%C3%BC+sorularPDF 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_off0000ed64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED64 12044 bytes
SHA-256: 351674c1d3beda45131ed294727fa9831c73fa7626ecad9526298611a154eed4
font_01_sfnt_off000108ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AD 19700 bytes
SHA-256: 43eb4dc8db56e7984e8c52f8f361f0ed427a4af80a1eb0e042442cdf2182c4ad
font_02_sfnt_off000139b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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