Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea02d935194c313…

MALICIOUS

PDF

77.3 KB Created: 2021-09-12 08:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a2c1e204fb73018023dbaa7606780eed SHA-1: 67debf46e8af2d53ba3592c6ca3b7b1c546c28a8 SHA-256: 9ea02d935194c313673211fcd6729ca8dd92275a96e3ef4a60d5deb57100414b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to potentially compromised websites, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple external URIs and link farms points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/67782037461.pdf In PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/51605028115.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/pisubafajesuseduduf.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210911_CA7E7483878BB1A5.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/niparonujozukodiwimam.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/nozojabix.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/3586879377.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/vonopuvo.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/novanipefikujineju.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/gukiropupumuz.pdfIn PDF document text
    • http://enricobarraco.com/files/lupotabodegura.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/55370430874.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/posefotisewafutuvufititax.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161355f42e49f4---99398132651.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/83844762257.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/1220079092.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/27486668746.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/xarenotamigimitatam.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/gtsgpqnaatjfnjgs8mk2jf2n83/korolubisiperabeja.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161305f27a8f6b---detakokimivuxexanipi.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c6d35f335---12724880439.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/72783904730.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/sefasopobedov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=gta+v+download+for+phonePDF 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_off0000cc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC46 16984 bytes
SHA-256: 4540d35042ddde9de73c9ac09465c0b59b968cea41a9158b1342877d5b934d45
font_01_sfnt_off0000f808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF808 10528 bytes
SHA-256: 45bf54443f0ff3f53054c79d1eebf701b28931585204d3d57bf998918ce5f9c3
font_02_sfnt_off00011008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11008 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1