Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c7dc0e2b7cbbb6f…

MALICIOUS

PDF

83.6 KB Created: 2021-09-03 06:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 352e27ea24f6a68f5173dc256998f096 SHA-1: f081252123a4c6d276a755c6352dcba85e95c72f SHA-256: 3c7dc0e2b7cbbb6f9b71ff283651ecf296aafd6047afedceaa43f9d60b3a0ea6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a phishing lure, specifically by presenting itself as a converter tool. It contains numerous links to external PDFs hosted on compromised websites, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://mobilni-kadernictvi.cz/files/file/14442527277.pdf In PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/50906148719.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/ad47fc52491789d5984032285710c53c/jogosuzagozigasemojedu.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/38sgjqrmili0hr1aoqhnhhl3v4/31896180913.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/91528714722.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a527a812f---fadefepekipewuvigu.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f690b0d47d---74303000972.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/92773115429.pdfIn PDF document text
    • http://smith-williamssisters.com/clients/d/dd/dd6cbc7353a6ef31c13ccaa63ab862ac/File/novevarazitamazolufodavem.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/lpbv7oatqbtr8pukpg1kf6s6uk/gujupuxesub.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/16097092404.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/1ttnd9d91vtvumk51dvc5v1l85/33931994674.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d2b2f2d9b---kizij.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20217152036205858.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/dobowiwada.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28b4d3d7f1---popasofiwabigoruw.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/skastbpqmjh54sh62n77rcmcdd/40302497175.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/zolelajose.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/3es5865u2kbscok8il4sdufo8k/88758237008.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/70854871117.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/33ba24d6c4973e3eefe1993f85d92178/58912334469.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/4b69ed881b5839b28fe2e7eccd0dfa15/gololilapokimomamoxevodu.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/botajupabavoxusuvikure.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/daxovulumurufivad.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa02b783633---faviboxagawetilowere.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/remipekemeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=converter+pdf+to+word+download+free+for+windows+8PDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/d69b581a0aea6af1a1c80c1bb62576c0/wovivumug.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_off0000e2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D4 17124 bytes
SHA-256: b1d1816def5c38e7c7e13a793f1fad208a740dfa59c4104b32ca48e978f7d626
font_01_sfnt_off00010f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F19 10884 bytes
SHA-256: dee6ce3f94bbcd483be9b562335248759c892842c8c484c8a38501887f8d8afb
font_02_sfnt_off00012880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12880 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1