Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d9a956fb37ac53c…

MALICIOUS

PDF

86.5 KB Created: 2021-09-13 12:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3f1267e3f4740588b91102292a4adff4 SHA-1: f1589b2f8b84ce2d4ae5894a470695ae93d04c98 SHA-256: 7d9a956fb37ac53cf20b4e54e315cedf8374bf4950989febc3dfcfc32ef97e28
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://steakclubhn.com/campannas/file/zoxexoxibopezebis.pdf In PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631432794.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1b20da2e5---95252198942.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/vifizaroxuvufuwisidituma.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/zojipajatumuletufu.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/6125912340.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/80257932562.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/gobolagutem.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/zemidoniwezojevavakiluxu.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/104718380.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/gusokepikejimivasilu.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/42905579736.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/17532113152.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/tumugafomike.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/bijitafedazo.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210913093523_1752764637.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/5ohgdmosopfguoiamule0rc5u7/36893336891.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/losaw.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161382523295a0---zesurodafewarelojeg.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/66061915759.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/576f4fbf9737d7ab8953671e465361f9/fiwimilopunajabuwapo.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/92629342097.pdfIn PDF document text
    • https://dellrein.ru/content/file/91254098516.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mufoxipusozetige.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/jivopokuwuku.pdfIn PDF document text
    • http://st03.it/userfiles/files/65792283594.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=online+horror+games+androidPDF 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_off0000ee18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE18 10620 bytes
SHA-256: ab730b26562b5d8cf9e60546df3679ca05a221679382f8f9369f30ff67615c1a
font_01_sfnt_off000105e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E8 17596 bytes
SHA-256: 85131567b9713aa13e4bb553b2884c2d7ee47a439cd3a5c28979eb852f549948
font_02_sfnt_off000133e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1