Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa3b44cc9654d1f…

MALICIOUS

PDF

94.5 KB Created: 2021-09-17 03:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e6f8840e2e1e102db03f9998c1962c24 SHA-1: 995781872e57cd17f8b5417b9e43756fcf231ba0 SHA-256: 5fa3b44cc9654d1f0eb22c4f2823fc9e0b21242b3ef4f49016e262ed71db28aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be part of a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://nomylo.ru/uplcv?utm_term=gallery+for+android+tv PDF link annotation
    • http://northmarking.com/userfiles/files/93823778424.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/roxatojo.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/zunagurosovipurusudenek.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/46012585611.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/76181604297.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/topaneze.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/2109032128275585774iyc1f.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f77ba6e8f1---datupuwigokedovagukipij.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/wemojisisos.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/48067815780.pdfIn PDF document text
    • https://jin-ji.com/upload/files/nutusufo.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/rezujepovorixokugasati.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/40871295886.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16306484798665.pdfIn PDF document text
    • https://tekmaker.com/upload/files/fevobukore.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/sanoxovosotopefuseg.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/juxirelaturodukub.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/11085862739.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/21253695008.pdfIn PDF document text
    • http://qigong.ru/userfiles/file/11845400306.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/vuvixiretoloxoralu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613faa71183fa---somigevurin.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613078466cd26---5091796373.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/c4323564b07aac3d65f34e1f6a7a74b1/lawidufoga.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/topujolevuk.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_off00010d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D48 10396 bytes
SHA-256: 5d8fbadf672812ac5587cd0291abc60f12e605cd9d1b1467578be426fd8e6648
font_01_sfnt_off000124f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0A 18336 bytes
SHA-256: 69d4d19ab92c96b0982b36d8c681833e332a900164eb6e802ad605c08f3888d0

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