Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff6651ab3f052897…

MALICIOUS

PDF

87.0 KB Created: 2021-07-02 06:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e2d5a3d0f01765d5c1567d46668499cf SHA-1: ad21fc3e41adb0a1e2ff48e0c825e152ce76b6f1 SHA-256: ff6651ab3f0528973ff87150017ddbde5e8a4019f62b8fb1e7fe8f0d878101e0
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure the user to a malicious site for phishing or to download a second-stage payload. The presence of embedded JavaScript suggests an attempt to exploit the PDF viewer or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/3dbcbd8361fb7afa62ceeef53e8caa7a/74888141390.pdf In PDF document text
    • http://ahcxdq.com/uploads/file/180444047834.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/8rf93frfb30td55mf8p9rivde9/pirezikubagogopofazidug.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/welezojibuzutixatenem.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3abcae85f---raruwel.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/eba0db783f46a8791a3b798d6526d72c/vamivexumibowazixuz.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/wurazarezebewifaxofi.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/busoroxinizalizovo.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/fa19ed990acadb7218445d707558a518/degatejalakajetumal.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/37629609196.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/68370379903.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707309d1afc---11086959363.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cebdbb3f07---65686951614.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/4a814632c0b1ad48be2c13e3de69e5f1/79225617645.pdfIn PDF document text
    • http://sowitech.vn/upload/files/teviwowofaxujukezixomuwu.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/boveratodi.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160948838e3767---20184967719.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608112be5b4bc---fatus.pdfIn PDF document text
    • https://tonitomov.com/picture/file/29792878106.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/99a5c38140f9ecb26de739fb670c9c70/gijabafumegalonukujudid.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a6756b2a9---dixazeteluvorof.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/30514314286.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/7e927092db0c3a86af1be8da83043646/20093762991.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/dukinaronikoruxawunadev.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/zolejelomitawosefipigo.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3060e64c0---11448254479.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/vuzexivexinu.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/qjpooce7l1bas9jkeh3ilg5tq6/nivokatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=68+number+plate+yearPDF 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_off0000f19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AC 17104 bytes
SHA-256: c458734afe597a77e55490070ec4fdd72f97da4ece3c7ec8881820345e72dcf3
font_02_sfnt_off0001369b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1369B 10664 bytes
SHA-256: c1e79a48a6d6f72165816f5a0cc87ccea4977118f44a7449976389d901d0039a

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