Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b59d5396c80a262…

MALICIOUS

PDF

69.0 KB Created: 2021-09-26 18:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 694b38acd2a23ef58cceda14ce1efa13 SHA-1: ae2480806608cfa165be9a86fd8dfa12a0e79686 SHA-256: 8b59d5396c80a262b7d05a3b1259ec8630832468b489352c53dcc1c4271b3f9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of numerous URLs, many pointing to potentially malicious content, supports the classification as a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://aelma.com/sites/default/userfiles/file/46850489601.pdf In PDF document text
    • http://duancanhotot.com/upload/files/64561052651.pdfIn PDF document text
    • http://gmt-tw.com/app/webroot/userfiles/files/nikelareraxidamigepusa.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/jiwimej.pdfIn PDF document text
    • https://fivetc.net/uploads/files/fasuwimogisekuvevod.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/wukakijuwurufuk.pdfIn PDF document text
    • https://clubselect.ro/ckfinder/userfiles/files/99576066307.pdfIn PDF document text
    • https://oferta.lt/i/File/seroraw.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/gepufaxonoxagefepa.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/fupujigabezoj.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/xurinaruxiji.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/vubulipadereganoxawobiket.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/30723733523.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/1f8c2e2c7c95f656b6035568f0774f73/22544274417.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/45148402475.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ff585d42d9---15076307244.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/wigasonoroxewer.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/a63b012a4f7115d6ab0e1895f34eafc9/97474637107.pdfIn PDF document text
    • http://benly-carson.com/product/files/34004940931.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/lonoguzinisixazijawu.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/85160743339.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=gamez+droid+gta+5PDF 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_off0000aeba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEBA 15764 bytes
SHA-256: 920c810b884dba8d5dd282dbe91883c092fc2462e355f0477de1d6b8e515fbba
font_01_sfnt_off0000d6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BD 10508 bytes
SHA-256: c4dacdad26f72f1756033b097349b1fd13927abc5c76d6ad37314eecaf01bc4d
font_02_sfnt_off0000ee89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1