Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9452c262f6f9ea4…

MALICIOUS

PDF

80.9 KB Created: 2021-09-20 02:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 712852b7fcb34a580e81780316ad74da SHA-1: a043b9278f820e55cd99d96a5a14940cb28486f4 SHA-256: f9452c262f6f9ea4d6c1d116463b72a92f2f8d0aa0c5caf378fe4423025f4193
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URLs, many of which point to compromised websites or disposable hosting. This indicates the document is likely a lure to redirect users to malicious content or download further stages of malware. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://philabc.ru/uplcv?utm_term=rpg+game+mod PDF link annotation
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/nawezi.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/78807307824.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/22691425631.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/8784949244.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161471d171b476---gosudabidasuputeronuw.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/1d2faa836bfd21176091246c38b48c28/kogixexunamibakawinebom.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/rodokuwemiriwujawalak.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f84cec79e5---nifiwigewalomajujala.pdfIn PDF document text
    • http://ccsl.asia/files/bujirevureriluzibile.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/84035491713.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/d20b71169c99959621343631a957ce7e/jevedomutadulazi.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/8649559786.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d94b9e8a30---xokilufe.pdfIn PDF document text
    • https://datenglagi.com/contents/files/netovurexuzepelasovu.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/40924335908.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/91301168424.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/vezivebenis.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/6100494678.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/jeguvada.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/pimesowedejojewun.pdfIn PDF document text
    • https://equalland.com/uploads/File/69013769540.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/e0e9a1ba904aef1510c878a6c8c2e96b/90243753533.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/zikekofupogomewa.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_off0000dd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2F 10172 bytes
SHA-256: ce96f86d875353a2e9bb23be64640b425f7d935f9939aaa126d1d9c174b2f51a
font_01_sfnt_off0000f3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B1 16600 bytes
SHA-256: 4649d942b20063b9d122c32411c79432c6aa987ce022ac83e8c829752cbfb06d
font_02_sfnt_off00011e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1