Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d58f45e8c250146…

MALICIOUS

PDF

80.9 KB Created: 2021-09-13 17:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 08feaab6b0b114a38d42b4ca1623bea2 SHA-1: 09617f8d9777c7def91d1e46ca76c30e9e839e49 SHA-256: 3d58f45e8c2501467d1798bbe4b4b6c05cbafa421e599aa86a93768c63b292c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The ClamAV detection further confirms its malicious nature, identifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://infrive.ru/uplcv?utm_term=antutu+redmi+10 PDF link annotation
    • http://grupposcorcia.it/userfiles/files/98790215701.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613baa5a92859---51561387619.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/gixujutawefogelorakusimul.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16135eb6be618f---wugagoxodufapa.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109011609259066.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/5299148209.pdfIn PDF document text
    • http://soc-in.com/data/media/files/mudekub.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/sikexedilavememebe.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/zazaxiwubovipenuda.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/95691714882.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/fudogesasoru.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/19316592320.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec93538b35---43374347603.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/83290485233.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/sitozifaxexi.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/jemiwuz.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/48700297213.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/bejumosotut.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/56254587162.pdfIn PDF document text
    • http://merwepizza.com/upload/file/10672396392.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/84672626356.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/75996684992.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/zokufaz.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_off0000d70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70E 18572 bytes
SHA-256: 6e9425d237d0d88803932803983c7c941a2734e2758b0fdc48980d5b3daa5cd6
font_01_sfnt_off000107cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE6 10168 bytes
SHA-256: 493757c8f2338ba59bb38d55793568e6d2cd503d788770dbc04d6b8dabe75ff9