Malicious PDF — malware analysis report

Static analysis result for SHA-256 d42622da2e4fe54b…

MALICIOUS

PDF

83.8 KB Created: 2021-09-23 00:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ef6a466083542e131aaaf008da942203 SHA-1: 731693f99399c8b9d7ff0630147790a9fdce9236 SHA-256: d42622da2e4fe54bb703eb1c670441d50caea6d9949651d931d205b98b497e6c
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document is designed to trick users into installing a browser extension or update, a common tactic for credential theft or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or social engineering attack, potentially leveraging JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://loscogliodifavignana.it/userfiles/files/97083685763.pdf In PDF document text
    • https://infoenergie-loire.org/userfiles/file/numav.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/fisavefakomovojepagixe.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16132062a1ffb7---14138293832.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/ca30f2b1fe60d7639472caeb18151cc3/gorotuvapeponewemavuta.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/84734808010.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/20219221429454914.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386b622f44f---kolilarufeb.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/6162452576.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/89059793386.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/xibamobaluret.pdfIn PDF document text
    • http://olapromos.com/ola/uploads/editorImagesfiles/70293405832.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/viputisoperinetobubukop.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210912114703.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/97194313709.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/75541730543.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/nirifaginisidet.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/15862036881.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/vajomutitisipizewasito.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/759b03a0098005c472089b21552db426/36718817651.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9957194b0---lerorivorekatopedak.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/kerupajameriwirefifenibe.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/fijixedumelanirefaxoz.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/51919897580.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/fozotatubofatisakorejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+do+i+do+a+snapshot+on+my+phonePDF 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_off0000e00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00C 10704 bytes
SHA-256: 8e4c68f135f1fb7f86b23b7e9e4146634d3ad49278474dc0f4acaf5667218866
font_01_sfnt_off0000f86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86A 18820 bytes
SHA-256: 5f3e62512c795980a7c679dd44eac1b321fc7f947dddc285346c1df7b88614cb
font_02_sfnt_off0001290d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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