Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4e0c9c9b5aa1a5…

MALICIOUS

PDF

88.9 KB Created: 2021-07-24 07:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1d681396d9f102b9d2edc75592614bd9 SHA-1: 844bf82b5fcc2aec757a788ddd2b7fdb6abc5001 SHA-256: 4c4e0c9c9b5aa1a558aba3acaacb6ab0b27db36b7f9173113749288d3bfad8dc
156 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by multiple heuristics and an ML classifier. It functions as a link farm, directing users to various compromised websites, some of which are hosted on disposable domains or use compromised CMS upload functionalities. The primary purpose appears to be redirecting users to malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://axwelindia.com/uploads/zenugexasoferowigikizawu.pdf In PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/46191200059.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea1fc208e2---70441578844.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43ade29eef---4993831215.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/3d51a8d2ac421f9f56fb219c8b57ab15/29635617452.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/90e8f3909aa76e35030871f76a2336b5/riwofivagopukopoji.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/wudavumosuponoluginemaven.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/b40b5c82b38ce2a0ad3c2869ea6aba6f/79362175854.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/rvl0mge6m8s512mbt4uddp6jl6/mekigowejowevojemibefa.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/jizokiletuvodimetijawovas.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/42fn4qdke8msiuhnc7qohv6et3/35227160489.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/55713346725.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/55622d634274570a71b8b969bf99736d/vetasujimujodixeduza.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609caf68a84a3---gexasokudisesareliz.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608de3db52f4e---gavenesogi.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/tosapilonibit.pdfIn PDF document text
    • http://tipiland.net/upload/file/ranizur.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/pukowikiwinelavamexi.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/0ae8c68e5902772352d74aa4c1e88658/66075882133.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/5c7f34ecfe942719824019850f4b3d5e/47620376548.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-30/20210430110002152097.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/pixaxapetisunafunutiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+adjust+a+square+d+well+pressure+switchPDF 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_off0000f6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D5 10960 bytes
SHA-256: 0f8e1e6be00aad1f654b0f9b7c19a044b66f947b52f725e60d487f03dce8bb22
font_01_sfnt_off0001102c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001283e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283E 17304 bytes
SHA-256: 3c4b2ca5676e0b82829e24e04d2b36238e64779734f0a15d2baa6e77a5f843c0

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