Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cd581fb9547872c…

MALICIOUS

PDF

94.0 KB Created: 2021-09-11 15:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e5afe3e91a94cae127c9ca542944b44d SHA-1: f0f93c7106a742f501d5e62c2aff1835dce27eb5 SHA-256: 0cd581fb9547872c43de163dfdf206192c1fdf524f0b172d8c9177dac66f92ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which are hosted on disposable domains or compromised CMS uploads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such links for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://synerhu.ru/uplcv?utm_term=fast+and+furious+9+watch+movie+online PDF link annotation
    • http://reversetheclocknow.com/ckfinder/userfiles/files/logajokalubiwedifabi.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090711251220.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/forakupafot.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/81661808538.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/90873767229.pdfIn PDF document text
    • https://clinicscrm.com/img/files/banobex.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/vozarosozapivitojinirus.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/pufalotezi.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/sedemoxoto.pdfIn PDF document text
    • http://st03.it/userfiles/files/80683010627.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/82808572923.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/faxinejomowaled.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/lafiwajaw.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/nafima.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/95918714518.pdfIn PDF document text
    • https://kermanrooz.com/img/files/12459478620.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109010904241852.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16136a862c2367---surusamusugegevilej.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/vlmdpg8vp0ja16l4v9291jr0bm/86515230883.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109071744265809.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c67d3a55b3---xovapato.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/96451263788.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b91ce0b19e---pejozowiludibafu.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/24634983751.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AD 11136 bytes
SHA-256: 8570c4fb2ef1a830f7f1874bc61b2261b29e907bb28ecf3542d06726433e3419
font_01_sfnt_off00011d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D99 20176 bytes
SHA-256: ff8d97560e8671e3dcc52bde11a57fe553b4a47c019bb026f371f2d69910cf4e
font_02_sfnt_off00015227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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