Malicious PDF — malware analysis report

Static analysis result for SHA-256 737edbb6f6986387…

MALICIOUS

PDF

85.2 KB Created: 2021-07-05 03:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d5f3b564b17094f09e5207e2b8e383da SHA-1: 9d9ad8ae017f2e07ab97c7ca8e5dd7b89e5abeb5 SHA-256: 737edbb6f69863872452c0ac4eb8122086a71a27448207de2c5368850d7ee6bc
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing and potential trojan threat. The document employs a social engineering lure, instructing the user to install a browser extension or update via links hosted on compromised websites. These links point to further PDF files, suggesting a multi-stage download or redirection process. The presence of numerous links on disposable or compromised hosting, coupled with the 'browser extension installation lure' heuristic, strongly suggests an attempt to trick users into downloading malicious content or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4136cc15b---46772054293.pdf In PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/eb045d05be1f64e2d46939466785d477/zudozuxirulozasubibedekix.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/79007794314.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b9e252ad3---jugatuvobagopixupudejuwag.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/dixidavawutobasuduzumimi.pdfIn PDF document text
    • http://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/8143671088.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/52189101.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/sifaduvulaxatubez.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/jituxukafarabew.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928a8b1bdf4---7499354102.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f8001c62d---megixuxonevadul.pdfIn PDF document text
    • https://menu2uplus.com/images/file/pufejezexuri.pdfIn PDF document text
    • http://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/perosusinelufudeb.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/161401eef8cccc58a0b580cd3c9f42c3/91580008375.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b9bc47136---78198107299.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/xabitiruge.pdfIn PDF document text
    • http://eibich.de/layout/bilder/file/38423233076.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16073b510d93e1---mitapedovuvewonezew.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/d697ad5e8b49c9116992affbe9868e76/64316866842.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/kubonexulegezokizi.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8625f3e515---25530964522.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/24637664613.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af96b7880d1---zerizafo.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bc578a5c1---buranananogidegeserufofa.pdfIn PDF document text
    • http://biomisszio.hu/tmp/pefanekavapatedajosefif.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/30611493781.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/95831967641.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+edit+pdf+openofficePDF 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_off0000ea8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A6 10212 bytes
SHA-256: 7fdcff5240136691afdc37e2eeca84dcaa02dbbeaeb045381c8377aae08d52ae
font_02_sfnt_off000119aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AA 17340 bytes
SHA-256: 0257c90b05546057ba66ecf169607a521a4b610e87139a93bddc28bd0a4c2d39

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