Malicious PDF — malware analysis report

Static analysis result for SHA-256 34f366f6e44b9709…

MALICIOUS

PDF

104.3 KB Created: 2021-09-10 06:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 722502f8acd66d9f48b4e87f931e9ea7 SHA-1: eaeba4d620c41db78c5baef19d7ee189f9060008 SHA-256: 34f366f6e44b970992d9cf1df6e88de8c5a752389c3324630b7b515e498f4ff5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://inwebjor.ru/uplcv?utm_term=monkey+island+2+rom PDF link annotation
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/juwikewasixunapofiputom.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/xebogox.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/03/file/20210903_224808_162.pdfIn PDF document text
    • https://sambelteri.com/contents/files/38778271373.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/26058328809.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/7252583866.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/xarukizavotijopumabagoget.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/fazewiloxivajokabulogo.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133de4243ab3---78418765227.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/1381508c02ea81d54f5629a8ee1c8ac1/16446470430.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/20607902585.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136c0d033fb2---48862367529.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161322d6482429---timaxafasanokikar.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/medononu.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/togunatakimus.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312e084792f---ganamotilomamiwewuv.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/84779906949.pdfIn PDF document text
    • https://coevent.ru/upload/files/13903076717.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210901_195151.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac36a6513c---gupoxosagano.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/mevizikeduxuzofiz.pdfIn PDF document text
    • http://santeh.md/img/files/xejufedepoziwuwufenuv.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/gisupiboginuridobo.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/45495046337.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/nifiwavokajafojoza.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_off00013318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13318 18460 bytes
SHA-256: 80a9a2f9add54af05ed2e1d9fa186d6f6f7cd0cfa892835fe050eff35021f2a4
font_01_sfnt_off000162d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162D4 10632 bytes
SHA-256: f3edd07f39170c6eef00f4184c38c4921e5226c6c4f71d1d49af3c554fb3be05
font_02_sfnt_off00017b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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