Malicious PDF — malware analysis report

Static analysis result for SHA-256 39e37af243bf162b…

MALICIOUS

PDF

88.5 KB Created: 2021-09-01 18:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 65e0fa6f4192f0d07de064cbfa18eb5d SHA-1: 9abde362689706829e646d686b366bb4e0ebea2e SHA-256: 39e37af243bf162bd27ab7b9266d19ad93190b2cb50197e38e40f55359aed268
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external links, many of which point to other PDF files hosted on compromised websites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM indicate that these links are part of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://ctapigroup3.com/contents//files/zibaxurikuxumasex.pdf In PDF document text
    • http://eastcity.hu/ufiles/file/dilisonipasaderodopixiti.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/moxefokugul.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/14775220795.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/91877318315.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/xujifudadavidivimu.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/77971482448.pdfIn PDF document text
    • http://richwoods1969.com/clients/861079/File/bidusenoxagaziniru.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/ratokiruduzusivefim.pdfIn PDF document text
    • http://teaandtiara.ca/clients/c/cf/cffd5a667a547ddf6f7ed7e454f715b7/File/50418875565.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c8cb25115---xigiw.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/67597539347.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/5245261190.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/61160123533.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/07b80e656731f1e626e183aa4b383e48/29786376102.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607fefdae1048---mipawepobusiwox.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/xolajedupivisika.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/407e3ebdf28935c82607c134e54d09c4/55653358500.pdfIn PDF document text
    • https://menu2uplus.com/images/file/69150267101.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/e2253efab07d3025c6e144bef5838218/35793469684.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/20258858052.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///34875124335.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/96341648042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=pink+and+blue+rose+tattooPDF 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_off0000f5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B9 17680 bytes
SHA-256: ac8f9b69aeadb2e2d343ac2654e31e9b9854f2bfe1e5a9336e95596a79d207f5
font_01_sfnt_off00012350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12350 10576 bytes
SHA-256: 9cafcd0034751207b0f382a4183c0476103d5f5d5c6d7c8761e78b7bd0a72c08
font_02_sfnt_off00013b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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