Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eb20d9250ec92f1…

MALICIOUS

PDF

86.2 KB Created: 2021-08-01 12:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d839833de1e57f4373781348ef73795c SHA-1: f74530073918d8feaa49503dbda87c7498a08369 SHA-256: 1eb20d9250ec92f167aaf7ae3e9aee0a148ed1adc318c13a4794d16bbf569f38
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The document body is unreadable, but the presence of numerous links and the detection as a phishing trojan strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://wksystems.net/HotelEstimator/userfiles/file/misawemanowukasawobapug.pdf In PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6602d8c03---5365514948.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9dc0a0f33d---kimawabeka.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/82cc69d971383451221c05bec6987d3a/didur.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/48369191099.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/ovhlpmt5a9v7e0d1480tdnclf6/xoxigutiveziloritovexul.pdfIn PDF document text
    • https://media-get.com/userfiles/files/zejedorapiri.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/35497100543.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b695ba674c---kigavarepebebedevapuv.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/34083138737.pdfIn PDF document text
    • https://virker-ikke.dk/files/19257896660.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/dce98048bcfab1512f815d935435759d/tawutupotozi.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/74468909484.pdfIn PDF document text
    • http://congtyvima.com/images/Download/funagazuzipafanimos.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/41107958128.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16096669f281bc---puguzokaxugoreluwezawad.pdfIn PDF document text
    • http://misspacificus.com/clients/873634/File/60359691965.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/nupejoliwarilidugimebu.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/50669524970.pdfIn PDF document text
    • http://starlightskiothon.ca/clients/4/44/44db284a3a4a6a3f34f8f2fa71918f98/File/jarifebererewifepap.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ce8a53a61bf---84559162663.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/12040841772.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160933502555b9---42157223676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+much+do+airline+pilots+get+paid+an+hourPDF 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_off0000edfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFB 16660 bytes
SHA-256: 1edbc7676fc23470cdac59429c62a987e12b7000cdcb3370df7eeeabd39e9851
font_01_sfnt_off00011939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11939 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13150 11140 bytes
SHA-256: 3d974b533e3c76b9dc299f5336594afddf78b03fd7be3e7cc1421d75e8b36741

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