Malicious PDF — malware analysis report

Static analysis result for SHA-256 17b204cb41506037…

MALICIOUS

PDF

84.0 KB Created: 2021-09-19 10:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bbb77baacff1195c00cb22e4066485de SHA-1: 277d9481b84f5d05dd751aa00050ed8d890d4ab7 SHA-256: 17b204cb4150603778cddfabaaec4e56034019432ef62ef1401a32a96b459480
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable hosting or compromised WordPress sites, indicating a link farm for SEO manipulation or hosting malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://princeverma.in/uploads/files/mefezexeteko.pdf In PDF document text
    • http://progfin.pl/userfiles/file/puzaduzubavopafulasomofoz.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/tolerijewinebevod.pdfIn PDF document text
    • http://vestmorecapital.com/images/epost/25500794295.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/37573220126.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/10285328331.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/88324094142.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/sakeveneramuwopase.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/topikixezebow.pdfIn PDF document text
    • http://svx.su/ffile/file/dojaliliduvafugimawoduzex.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614147f34d49c---1074049575.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/97948136871.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/xubiwepelesiviserufiz.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/70749908709.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/qjldop6u291nmn09u9vc88arv7/7523325734.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/roxetamam.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/nutidazezikiv.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/tupusetesebuva.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d0a60e1733549458fd8b71fc79e6dbd0/saveminitozexoki.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/89049419324.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/sazujijozevulerisavide.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/kekobofijesobitak.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0bf94584e770c77f2523f17bfff0b96d/bumawujiranobagelisegem.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/185679165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=strategic+command+wwii+world+at+war+cheatsPDF 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_off0000e1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CF 18252 bytes
SHA-256: 3b8c93ce36948e3542429d968100493ed988e677f9a985ffc82a9b8903107e99
font_01_sfnt_off00011118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001292f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292F 10980 bytes
SHA-256: 12f1b151401bb1ac938d0cb1e7b02ae5b4907cdf957be4788e1cc077201424f3

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