Malicious PDF — malware analysis report

Static analysis result for SHA-256 5245ee7114aa6d71…

MALICIOUS

PDF

90.6 KB Created: 2021-09-05 02:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 38e470ced4dc994d21410b73c23bfbe4 SHA-1: 0c48ab691411565157b931be833a98b33d4db091 SHA-256: 5245ee7114aa6d71e6c2ced5175aec5b598cb86aca624b3db898223eb1118286
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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 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://coretry.ru/uplcv?utm_term=represent+3+digit+numbers+in+different+ways+worksheet PDF link annotation
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/faveloriwanuzawenoluzeseb.pdfIn PDF document text
    • http://missinternationalbeauty.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/44552669481.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/gezanerigitubujup.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/anlhpl903208ru8b6ekbe4qu42/75572753874.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/80b6d60e2758ecf59395de9d9cc7599f/54810181570.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/gufasomifikovudip.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609e76b06822f---gakimuxemigovudij.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/81668696482.pdfIn PDF document text
    • http://rajeshjshahani.com/clients/d/de/defaee86e9f1fedea086b53a5072ac2c/File/1129593558.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/kujixezovelofonazapuwe.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/75866807744.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/wiwoluvavopukuroju.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160865d00f0286---76407321220.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/8364315007ecc9d1326a254e8fbd66e0/67552421036.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/pixipetazovufor.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/7433034564.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/30496780356.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/zipivabup.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/saliro.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ddtk1f4q6nkigqslenu61m42cl/86960172607.pdfIn PDF document text
    • https://www.agcontraincendios.es//ckfinder/userfiles/files/fezawoxitimifaxokuzivoxuj.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/ravogutod.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16084f0b22b4ea---77141462168.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/89789610212.pdfIn PDF document text
    • 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_off0000fbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E7 17516 bytes
SHA-256: dd532ef4df9cd2a58fc2053488a3c6840f89f21df1a2ad6fe8e9c2856094219d
font_02_sfnt_off0001411e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1411E 11648 bytes
SHA-256: 704f3f3398233d06930b8e326090f1067185438b43046a797fdcce6138a7a2b4

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