Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0e70a9c8317a7e6…

MALICIOUS

PDF

82.6 KB Created: 2021-09-13 20:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ab0c1d5ee58554132cb4a120eee468db SHA-1: 4f0841c79a2d76b1d1314a9da3ac529723e44b68 SHA-256: c0e70a9c8317a7e6a44f7b7ce64c301b245ef71fc0f77f381064db5ed3a3a137
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with link farms and compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

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://philabc.ru/uplcv?utm_term=cambiar+tema+de+google+chrome+android PDF link annotation
    • http://foxadv.net/file/48971042105.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/67320999037.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/dejaduwaduwixipobib.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/walutogimiripiwizukusix.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/zibogopajota.pdfIn PDF document text
    • http://lex.tj/img/file/1295389208.pdfIn PDF document text
    • https://wildnaturetravel.com/File/88209700932.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/vojelibimake.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/wudosirawogofo.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/390065599.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/tegom.pdfIn PDF document text
    • http://esen.life/userfiles/file/fepovupame.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/katuvelezis.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/1691583495.pdfIn PDF document text
    • http://podarox.ru/public/files/36914720962.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/xivolob.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/nujojomon.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3c78a57ae---sunajanimenu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337c5214ed5---laziwusubi.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/30650246417.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/mufekav.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/wigijebinuruluwuwetabiw.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/34910821700.pdfIn PDF document text
    • http://rs-entp.com/upload/file/nuzupomedurowavezuzaj.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/4325b80c0e51873338b1299a69a0810e/vonawelikigafolofi.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_off0000dd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6B 10820 bytes
SHA-256: 11ab1640624b438d6495e647d5ae8364c283a3c0140c67bbe07bdb3103ece4d5
font_01_sfnt_off0000f5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E6 18172 bytes
SHA-256: d97f1a04f76f0b4daa3c8c2337fc48aed90eb578ff3efebd4c5ffa68eb2ca94b
font_02_sfnt_off000123fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1