Malicious PDF — malware analysis report

Static analysis result for SHA-256 767dc830e6a8e442…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 19:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 22d901980818af448da7194b8b011116 SHA-1: b956c7ee07cabf8755aaaea83d1360bae4064424 SHA-256: 767dc830e6a8e44229b8a7e6687c1a566296360badb4f745050fe64cc25e73c9
196 Risk Score

Malware Insights

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

The 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 strongly suggests a social engineering tactic to prompt the user to install a fake browser update or extension. While no scripts were directly extracted, the PDF structure and embedded URLs, including one pointing to a compromised CMS upload, indicate it's designed to lead the user to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/fizutolaxilazibajodiwajad.pdf In PDF document text
    • http://hospitalityroyal.com/upload_files/file/suxisevutixebewezilata.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/57160521943.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/17594851320.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/28225999728.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/pobodesobenilemojuza.pdfIn PDF document text
    • http://esipro.be/userfiles/file/faturu.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/67334450573.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/072d7d294c25962edaad3be093edf5f8/55322917263.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/62332766442.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/xamasexedowape.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/55405889843.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/zuvenobekaxililanutarebu.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/64059528473.pdfIn PDF document text
    • http://pololanna.com/user_img/files/86495783737.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/63752118135.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/75792871030.pdfIn PDF document text
    • http://nature-revive.org/files/file/88552195995.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/nhbbapkqk9bcegml1k1in89mfc/2046062741.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/10343098546.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/loruk.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f300ccae81---befubegewadinatizolapux.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/95687715715.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/rupuvusuduwezosolivitifod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=dead+by+daylight+mod+apkPDF 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_off0000dbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB0 10812 bytes
SHA-256: ac5e61ec0f1ad1e3e0b556f2a06f424db966aecd2c6c3f7a275a4ab875521554
font_01_sfnt_off0000f42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42A 18076 bytes
SHA-256: 6d05502f5f8d533ce461a671289d32cb38f5fe63f6dd015db68f62a9f2024679
font_02_sfnt_off00012363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12363 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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