Malicious PDF — malware analysis report

Static analysis result for SHA-256 40166cebb9be67cf…

MALICIOUS

PDF

82.8 KB Created: 2021-09-05 09:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 11fb7f111f92133b69327ebda313bc51 SHA-1: 77a878dca3915f6f68713778ce63f61c799ef560 SHA-256: 40166cebb9be67cfe95c84d2fca302845120c1486017cd2c7e923680736289bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links strongly suggests this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://queure.ru/uplcv?utm_term=madeline+french+book+pdf PDF link annotation
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a352ebfbbc---disogidanaxojon.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/stlqf0ngcchdln8qma9b7mug24/xulinazapovatogibozogole.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/bekij.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/60819885687.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/40227543934.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079e1e843034---sodizunofufiguvate.pdfIn PDF document text
    • http://sooclose.eu/upload/File/labozumuzejomed.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/rijizo.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/4588e2c629e1c49bdc4acbed4a034f9e/18139938327.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b171d8967fc---4421407928.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/zajosamukelir.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/ripob.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160959ce780656---sodasarumojodolixupunevu.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/12850037284.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16091e4337f64f---83068031313.pdfIn PDF document text
    • https://best-label.com/upload/files/nunuxe.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/615673f1d8bda63a21feef3c586ff86c/jezeduginomarinimajut.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/sefejosutonulesav.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4541eedc9---ruxofigov.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/90623d57e4c3c0d696846f8f01d4c114/51165838306.pdfIn PDF document text
    • https://ambalatender.com/upload/files/nusutaturip.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd143e36c3---gurenakopesokuxalat.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ff4b4890a---fiwotowuvupararisu.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/104dbd2e05335f5dc07dfd39cdd36cfb/dadaguvoj.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/jisibixevetefibojasudo.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/46728459178.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_off0000df89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A0 10676 bytes
SHA-256: e87e9072cbeb251f2897ca470119553b5c72d8cf142ab46b15239f13ea4cf4eb
font_02_sfnt_off00010fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA8 17584 bytes
SHA-256: 391f70cd6a4326beb76e18308c7cdd1453823fa775d049efdb4e60f4ee407be8

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