Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e76660d3b58ea2…

MALICIOUS

PDF

70.7 KB Created: 2021-09-11 17:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f8a05679cf1317edbad9ee9d80a09d14 SHA-1: 2dfcba6a07099f94f1f01edb723a2e77fec01db3 SHA-256: 42e76660d3b58ea23f6e2ffdea27b0e7133ea6eea82ed01ec614804b287276fe
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, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting sites, likely intended to redirect users to download malicious payloads. The presence of embedded URLs and the nature of the link farm suggest an attempt to trick users into visiting malicious sites, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://bbfrontedelmare.com/userfiles/files/21491967151.pdf In PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/seditosofilal.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/23698370137.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/xisepisenifapobowurimepi.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613418307ad68---xatujikodafijulafibepi.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/2b69f6cfe605f0116f0082211857c0ea/noduxezaneporevifepexoja.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/72751387792.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137711af2f23---baxawawegizaluxozewoluta.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/kanefexerunujew.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/wizexubeparexutodidoloka.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/42764405269.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/rovexegur.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/7095250440.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/pajom.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/sonuxejapozixeta.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/1l6sukepm4haek90eabq7gc439/zirilekeramakakeza.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/tojanidulodibupon.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/14143897807.pdfIn PDF document text
    • https://carlojans.com/cms/file/35678850919.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/54050843927.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/20431965628.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/14889386765.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/84921537600.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/58718978145.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/nuzokimutegixo.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/vijepawavikosawovepuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=windows+10+x64+pro+downloadPDF 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_off0000b6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDC 10756 bytes
SHA-256: 1b23573d90a348f3990aa788e2a2f0fd0922f88becfb5463d07d3e8802b2ec6a
font_02_sfnt_off0000e7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C1 14832 bytes
SHA-256: 31ecf57bc159c303c8a2b19695210a0b8f4da11b970ba91c149211cb8e90c4d1

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