Malicious PDF — malware analysis report

Static analysis result for SHA-256 85399daeeeedc53c…

MALICIOUS

PDF

85.4 KB Created: 2021-07-06 02:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5fc14377f3ed0dce321638113724f3c6 SHA-1: c3a7de9393b93df49727a71f518027b0d87a8c19 SHA-256: 85399daeeeedc53cc5839258175ef084e71abf03db68c89e1a3a4a976c868d07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting it's part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the nature of the links and the PDF structure point towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://pistant.ru/uplcv?utm_term=easy+soft+pastel+drawing
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59b89da5c2---pepuju.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bddde156590---6845468637.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/71selij205bbl6bkpsnfj2jhng/26709194286.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/pnt559lpklj15dhv2pjeepg9t3/xisinibuxivopubofobozab.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/77212770919.pdf
    • http://bagiez.com/userfiles/file/marabatopefezalefid.pdf
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/87697884655.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbf0e679d9---fariputewibirodijape.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/e2646782e42s3q22l0e5ccjo49/86891877932.pdf
    • https://apoiotelecom.com/imagens/img_fckeditor/file/seluxiditu.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/84b84c4aacb51dbd11166c7bb3d66128/27629420595.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/d1649bf0dd8a31e4e82ac190916ca3ac/bulofab.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/4a1f66b73e3d4c2193c65a149be77208/pegipisisudafixasekefa.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/gmb4ceovqba0d62kvcs2l5hhhi/39050066546.pdf
    • https://muguet.fr/sites/default/files/file/porakitedinagemonilugilar.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/qt7qf03rp8lmbe05u44qlvb3cd/10911724307.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a7df29acf---kamumukifezamibodiwu.pdf
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/74849700307.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160975febf3332---xapage.pdf
    • http://sva-jeanroze.com/xmedia/file/tumonuvizabewu.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/6290d25822e8b8349295c66e6a9d7a68/zumulija.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eabc.bin
8d095f0df31766ccafd0630e7ad5a7cce0245057f0cd47149b890c5f29eacf31
pdf-font-stream PDF embedded font (sfnt) at offset 0xEABC 10856 bytes
font_01_sfnt_off000103cc.bin
23bf1751720ad1ab76a7cbd3e9b34665e30d92101586e48dd366658e3f439e88
pdf-font-stream PDF embedded font (sfnt) at offset 0x103CC 17272 bytes
font_02_sfnt_off00013070.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13070 16792 bytes