Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c4c2aac82e20263…

MALICIOUS

PDF

71.4 KB Created: 2021-09-18 17:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 994d883d427407b2e078421bddfc9416 SHA-1: dba8e78223139ebd617ee70641453254b74689b0 SHA-256: 5c4c2aac82e20263313c5e72f382b5991d1cc2c6dcb0d1e0ddf37c1739a74d05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://archism.ru/uplcv?utm_term=electric+dream+movie PDF link annotation
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/83956830726.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/notagowojan.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/tekepurapulowenuk.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/10229980188.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/sidejupegadowasob.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/disulirapadolijiju.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131493aa54e9---72267015978.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/rofatepub.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/52277542588.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/20182006046.pdfIn PDF document text
    • http://okudshava.ru/userfiles/file/widajupo.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/valega.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/tesatopapajonawofu.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/foterowi.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/dakekis.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-12/20210912175532319619.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/fararedowodopu.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/detanepibitivupala.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/335a487f3c123e4ceaef28011af00f59/zibisiz.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/36921564466.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/60083767773.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/ab72978a7f383859fb68950dc855f612/fivokaxolobapafafawejudil.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/mabepowazajawaragufijex.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/83388315757.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/36815045319.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_off0000b4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4AD 10308 bytes
SHA-256: 3aab7c8cc4347fb183d6dc0eb5ba2bf397780dfc79bba050315f54c2099f1483
font_01_sfnt_off0000cbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE8 17140 bytes
SHA-256: c9c67ec1533f5f5bfa5a0bef1469ddf0e826c14edd6348b5281b02ec3b87f5ff
font_02_sfnt_off0000f852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF852 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1