Malicious PDF — malware analysis report

Static analysis result for SHA-256 989c4849e8ee8bf7…

MALICIOUS

PDF

72.3 KB Created: 2021-09-27 09:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dab11b9e546c295989e590e5ea95bb73 SHA-1: 6fbf98d8b96db786242692ba7857bde11db652b2 SHA-256: 989c4849e8ee8bf7893a98d16c0378a7ea3cfb516dcd9c8a65d5ef2ca11e14ce
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of external URI links and a link farm pattern. No scripts were extracted from this sample, but the overall structure and URL distribution point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 5

  • 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://inwebjor.ru/uplcv?utm_term=star+wars+smuggler%27s+guide+pdf PDF link annotation
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/84684784574.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e2f3cedee---54546524209.pdfIn PDF document text
    • http://alcantara.cz/data/file/togagefexuzav.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/4845611163.pdfIn PDF document text
    • http://mlead.net/images/e/file/fujakuvenonizomuni.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bdee8eb04---motudoxaweda.pdfIn PDF document text
    • http://clubesolbra.com/uploads/files/fejenoladeruxaxilafarake.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/90443804950.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/nadojatazanikoxogisan.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/64333952834.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401672b1ef0---muxafananotufitegobexepi.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/dujajimefonofif.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/dukixijewobutegasigu.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/30609583706.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/21174035091.pdfIn PDF document text
    • http://oodow.cn/upload/file/210923020137816565meduyoc3i9v4.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/minoxotuxax.pdfIn PDF document text
    • http://kachelofen-prommegger.at/nalewemonobetikebal.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/ragekaxipuzuti.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/gepalejuvubonem.pdfIn PDF document text
    • http://northcity.rs/slike/files/xafemoku.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/61716900677.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/newapuza.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/fafovevinaroxupalixuri.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/zamowofijoduvudi.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/tiwukapaxadabolesox.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_off0000b695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB695 16932 bytes
SHA-256: 37ef0fbaae5bb9f9fff5a939895e786a988d6538b573d95ea34ece94fb25647a
font_01_sfnt_off0000e1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B5 10912 bytes
SHA-256: 80bec2a5d1e201a219652b79409482c02d9a813b15e347c08a9a44e0e43c4643
font_02_sfnt_off0000fae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1