Malicious PDF — malware analysis report

Static analysis result for SHA-256 69b839dc6854fb87…

MALICIOUS

PDF

88.7 KB Created: 2021-07-06 19:18:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a2bb98c5ff95b4f7b02a2dc886f7586 SHA-1: 34af5f4ac4b444869ba9f196dc78cbc13de3a821 SHA-256: 69b839dc6854fb873947e01e893f2e9dab5354719954d30b9276da9e46846641
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature, likely involving phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ujvje8t8jnbqm496fldhfv83r5/pefojelagasozu.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813541d608a---58854962604.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76c9a7367e---38003135122.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/4464a9e8122dc3f3b7f61c71fe8e6329/gubudalepavixelufugun.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5e00c5a89---fovogigebumixenipupev.pdf
    • http://anhbanglaw.com/userfiles/file/23592861274.pdf
    • http://borisovhlebprom.by/var/upload/file/kuvuboniwodel.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/66d1774ae2d37b6270941b2ec0ec4534/febuwanesasadu.pdf
    • http://vitanova-cattery.com/upload/file/34967411344.pdf
    • http://immodraft.nrw/images/architekten_agentur_images_/file/93268646919.pdf
    • http://eau-msu.ru/ckfinder/userfiles/files/48232868101.pdf
    • http://ukrainski-rosyjski.pl/userfiles/file/jezawesemuwiwipiv.pdf
    • http://progfin.pl/userfiles/file/sewekikizinalegewoj.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084ce446f7f1---55062755771.pdf
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/57298842592.pdf
    • http://vo23.ru/upload/file/sogufosojuvu.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a58c37193---1131486610.pdf
    • http://highendschmiede.de/highendfiles/file/jixinejir.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dbd5cb8dcf---14513336811.pdf
    • https://birudongker.com/contents//files/52032713197.pdf
    • http://phuocthuan.vn/images/pic/file/8087668719.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/e0280b85cd7c9310a8f5361c2f4a3caf/tunijoxevobixu.pdf
    • http://grandrosso.com/js/upload/files/nudelosikoguwaxaro.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/5a1b1aae3485330047e20ed477f5b604/8408256255.pdf
    • http://hncastlecable.com/d/files/xezuraxugazoropidiladu.pdf
    • https://mamo-tato.ro/userfiles/file/dekudafatopujipotiwi.pdf
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/98334835019.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=periodic+table+worksheet+answer+key
    • 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_off0000f508.bin
b229838743bbaf9028494712c38523178194446b6705898bf5318b83bea58c56
pdf-font-stream PDF embedded font (sfnt) at offset 0xF508 10900 bytes
font_01_sfnt_off00010e3f.bin
d370cf4ef3c02a8a645841be080b8ff045b8324327543c9c3b89af5934e86785
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3F 17420 bytes
font_02_sfnt_off00013b58.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B58 16792 bytes