Malicious PDF — malware analysis report

Static analysis result for SHA-256 599d81d5073b68bc…

MALICIOUS

PDF

84.7 KB Created: 2021-07-18 03:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8ac96417b58ca89831174a224a4fd4f2 SHA-1: 061a0ddcccd58131ce5d2fa390b4bda7d0c3696c SHA-256: 599d81d5073b68bc227091c633986929973e013f71fe5776a5f5fb302c041af6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. Heuristics indicate this is a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/b8fcff4b438142dea8fcc142d0b99127/65090309284.pdf In PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ee6e55719---tajuzilelino.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/77613636254.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5c343da41---foteforuwedowuziv.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/dofowodajazo.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f13c7692268---rafubokopesex.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/a3c0510f60c54a3a8aecc8b5496b4b23/lerasofupamenidoguxaluko.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/vovilunuxolemomenuxik.pdfIn PDF document text
    • http://coopmong.com/ckupload/files/89839195601.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/59147989424.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/nowuxibudefaxizop.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/161366581460dcdb688b9cf.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/bewurekexefula.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/jowaj.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/87569653859.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e404f89ddf2---40883826062.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/lijulupedapebumox.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cc35df6bc---nizuxog.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/41002318465.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/24724003542.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/jofapewe.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/9jve5af85bfdpehmm1vs0hg8a4/37830593745.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/d20eccf0d31f7db5ff3beb5d66767c9f/46371573942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=gold+wing+macawPDF 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_off0000e820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE820 17208 bytes
SHA-256: 68989e354acd80900fe001580ffcadd83456b2b66c4d937e9be773fe1ea75589
font_01_sfnt_off00011546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11546 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5D 10340 bytes
SHA-256: 31b626396599bb49db033789dc265e1fe8c270fba9968bc322fc16047f5838ea