Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fc3fb9452e3b473…

MALICIOUS

PDF

72.2 KB Created: 2021-09-19 12:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba960b4c88b682d939b195e604c5005e SHA-1: df3b07a2628dc268796b0c2d40ee208447643ab3 SHA-256: 6fc3fb9452e3b473c4d2c2bd4dcfeec926e2d2cfc7fd0f37f354f67fffccfe62
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, with several URLs hosted on what appear to be compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/bfut2bjf906dgh1g03fnqgo8lf/86314414513.pdf
    • https://menokatea.in/ckfinder/userfiles/files/xuwesijuruzu.pdf
    • http://daieimotors.com/js/upload/files/wowone.pdf
    • http://madurastones.com/userfiles/file/kerod.pdf
    • http://fatamorgana.fr/uploads/assets/file/66988960104.pdf
    • https://photopoligrafic.ru/ckfinder/userfiles/files/40778522811.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bc47d27f0---8845614105.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/f13sd4kqkkn5nrk04lf24iqr71/67726176787.pdf
    • http://uelzecht.lu/userfiles/files/lufoteladepezum.pdf
    • https://dom4m.de/userfiles/files/xixobowilimetelifavuw.pdf
    • http://kkc1.org/htdocs/cljr/data/files/warutitef.pdf
    • http://mariondhuique-mayer.com/data/file/zusiwofaxodugevazera.pdf
    • http://www.dean-cpa.com/files/adminpic/file/bipowagaxivudugiginiz.pdf
    • https://sonerofset.com/userfiles/file/joregipazatexejax.pdf
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/35300841150.pdf
    • https://impulsa.mantareys.net/uploads/plantillas/files/lizewekefu.pdf
    • https://a2designbg.com/userfiles/file/7863922623.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142c108d02f8---tejigejurosojowi.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141d54b4c7b8---zotasokafikilejiser.pdf
    • http://rinsacars.com/files/others/72437385717.pdf
    • http://insureavisitor.com/userfiles/file/81923911043.pdf
    • http://skinct.com/upload_file/file/Fl202109020451085264.pdf
    • http://autobedrijvenindex.nl/images/uploads/53035262937.pdf
    • https://manpowernepal.net/ckfinder/userfiles/files/nixiro.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/fbc01ee7a1af39b147971b9bc715a9c4/wasudiwutajofi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pachtaoge+mp3+song+download
    • 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_off0000b9be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9BE 16792 bytes
font_01_sfnt_off0000d1d0.bin
efd2e00201c279d5fe9ae5703bf0b5adeb92437952a70cd4270f15a2502650d6
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D0 15556 bytes
font_02_sfnt_off0000f9be.bin
eb38e0f3b7bceea809efa0db0f6bbbc5d912fcf1fd9d2d3cb79669a721d928a4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BE 11028 bytes