Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f79c9d939cc5fa3…

MALICIOUS

PDF

89.6 KB Created: 2021-09-06 16:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e23bf233f9692cc5678921e1cf82d37f SHA-1: b823abf1276c2806416852b0fb9ad8bd9d809322 SHA-256: 9f79c9d939cc5fa3dad1df23cb51b4663664ae31b4a7eee7551583174a7c8e8d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's content is designed to trick users into installing software, a common social engineering tactic. The embedded URLs, while many are marked benign or unknown, contribute to the overall phishing and malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://suncitygroup.ir/basefile/suncitygroupir/files/74736625329.pdf In PDF document text
    • https://fishuntpesca.it/file/rufakemilawibuvotamam.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5da31d0584---difimevalegaso.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/ruzawabixelavijuze.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/merok.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/sufekowumawogen.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a2366048116---jerepalaniwose.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/0ff02fee00bee222e2761a411081f57f/sidowifakiximekowin.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/b9872069c3228bac1a4394e30006b9e9/78062098500.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607926f3cf243---dovelosurarikijufavorileg.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/figaxum.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c010d4a278---44266758160.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/fomurivij.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1609e096134a0e---bomilazegubem.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a079cdd50c---55992848805.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/81223074542.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/3kiec5g5uc3osr5i7f1c6r2h17/tuwutemuzimeguzuju.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/xolavupidod.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/fefigogegojularogexujel.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/buvuzefupamopen.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/xikoretolag.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dee623d8a---18063401124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=firefox+pdf+plugin+not+workingPDF 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_off0000f7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D8 18744 bytes
SHA-256: ffed0005a7aa40d53f851ce521b9715709267720ec3aa67326ff1232639da832
font_01_sfnt_off000128ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14103 10700 bytes
SHA-256: 3e236edf16cdfbb582d32639519220bdc7cc9c789f3bab53ce079920bc301a1a

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