Malicious PDF — malware analysis report

Static analysis result for SHA-256 2639fd114e48ece9…

MALICIOUS

PDF

76.3 KB Created: 2021-09-19 10:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a291b8eca25f0df2b2779da35bdd1cf0 SHA-1: 47721f674d588cda4cf4fb077f4d928227679778 SHA-256: 2639fd114e48ece9687fa66fda0eb44d8f0991379501d1d9b193cb8f5cbd85a3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristic analysis indicates it is a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's content is designed to trick the user into installing a browser extension or update. While no scripts were directly extracted, the nature of the lure and the presence of numerous external links imply a social engineering attack aimed at compromising the user's system, potentially through a malicious download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be0d04cbf1---29446031801.pdf In PDF document text
    • http://moiarchitekci.pl/pliki/file/gejesagepasezo.pdfIn PDF document text
    • http://emeat.ru/var/files/34061223706.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/11796259721.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/ralel.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/97012198120.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/laroravumotosuzujotuvev.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/zevumowurukifajisife.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/96823577930.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/vilikalenudamo.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/29880944638.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/zededekinidaje.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/tewajavitaxelituleduxajam.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/gojekovabij.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109051922539724.pdfIn PDF document text
    • https://festacontinua.it/public/file/11951379684.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/lupelexegula.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/vunexosofodimutuvenikoxaz.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/85833162384.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/dexomenomivevopiba.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/dezuziganamipaguxe.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9aeac5a2d---lovuluk.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/wavevedetizaxuminuva.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614025f922a43---kugajez.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/votapilafovowalogofubil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=android+emulator+online+web+freePDF 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_off0000c78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA3 10652 bytes
SHA-256: 19206db36cdd3ce719f50a4a3f1b9db1727dfe073f81e069fd841dcdaff911bb
font_02_sfnt_off0000f80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80C 16908 bytes
SHA-256: 0389984eab2753dee099e323ed7648c5207eecd16ae6b21e4e63b58d780c2fac

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