Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf02d855cff7a1c…

MALICIOUS

PDF

70.2 KB Created: 2021-09-03 20:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: efd210e170565400f723eedfcc325adb SHA-1: f5a4905a12d46ba16c31ad5de9c4a1075034ac69 SHA-256: 9cf02d855cff7a1c60e62de5c69a23f9c744f27b88ed9c724d474e39da90cb1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to direct users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://coretry.ru/uplcv?utm_term=pension+scheme+in+nigeria+pdf PDF link annotation
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/0a743a6ff9ab1560002ffdfa3ebc347c/vofipuronerunonavutagi.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/doxovula.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/15844252983.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/bukudojedepolebubetire.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e25f2fc09---74460979916.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/27653054807.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612cbe990da0f---vepafirufodeku.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/36566984935.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/wodadanatoresapirujosos.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/zezananenulel.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a69679cce---xototekadopaziralizesonod.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160905d0455f91---72339264465.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/67d5acfb4fde9efb20c797edf0736e83/87118155633.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///xegogitu.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/1c1bf5sg8rgo1ujtjnsl5gqc52/kulaxunanolagedu.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///44942429565.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927bc879bee---sulesatogadan.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/17900749015.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/gipezuvefukipopatojev.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/28433393910.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/fapasadisewon.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/dolibuvupa.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7834495e73---89525173268.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e9d66b046---piguluxoxudunoludukusimi.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/gagomukoxu.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_off0000b4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF5 14836 bytes
SHA-256: c4785515a39f45f25f3f65d519133719a237ed7ceb6e81f05fca8de6f6f8b792
font_02_sfnt_off0000f28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28E 10924 bytes
SHA-256: a31918169ef7205a249e133c545597710363fd3017bde433df32d2ed353b8631

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