Malicious PDF — malware analysis report

Static analysis result for SHA-256 8503040863bb8df5…

MALICIOUS

PDF

83.6 KB Created: 2021-09-02 11:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: da1a8e1795a939fdc7994280b2de9ab3 SHA-1: b64cf2f42c88f72303d2844507dcf3192226ae84 SHA-256: 8503040863bb8df5d4b287e0ea53cbf8f3d84af45b7c76f2e350d5843b76ca73
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host and distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/dfe91fd0c2cc8b2485444c2a4d04008b/rimujakijirubiwekezidid.pdf In PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/618cf34f3a1c9c1d1805e33cf8934e55/supule.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/pidumelulerubujawuritiw.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/12148724554.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be771b12847---71040882190.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/wudekosudejelajizajikerej.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/kujazijezafovijajipuwit.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/fuvawavebipu.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/xurajidexijorutekoga.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/retuxiliwusise.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca808c83fc---gulegokegupelumonedo.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/17027108363.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/zebopuxakafeganimuropa.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/c8057a36a2637b3769d1e9c8186dd666/gujizamofixajatefefo.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/c91f69237cd7a9b1685e4f0beadf0236/wupusilulimumimupokajun.pdfIn PDF document text
    • https://onlinendttraining.com/files/80295712546.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/mcptt66cug2i97pvr2sdc8a1ha/nisimupemuzedi.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/kebarudewawedapibedup.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/288a45b1a65e88d6d732773ae6bf4d3d/80931402417.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd71195fe48---15166013809.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/35616993964.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f11cb7a7e39---fuliluboli.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/39509928978.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/46b573522543978127e773c0465e2cf9/dalibozagomiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=nizamat+ke+ashaar+pdfPDF 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_off0000d920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD920 10624 bytes
SHA-256: c8db010132880b85a4f608f8de9af3270b351dbfea74c74ff9a19568c11294cc
font_01_sfnt_off0000f175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF175 20548 bytes
SHA-256: 0f50e9f3c003cc3b88d628a3bea5d6215b4b5afe91d062e9716a54d1c4b3b243
font_02_sfnt_off000127bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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