Malicious PDF — malware analysis report

Static analysis result for SHA-256 965213319c56d841…

MALICIOUS

PDF

82.4 KB Created: 2021-10-18 09:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 426b47200fa1e64cbdf89e0641b2fcb3 SHA-1: 360789e953097a630991a3aa7c90519c7efd901c SHA-256: 965213319c56d841f330a635c71c09974a6dbe666503133522cca4acf8fe499f
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and unreadable, but the presence of multiple external links and the overall heuristic profile points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://arucax.am/user_images/file/52848547478.pdf In PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee13d1d6a8---finunolikuwegidej.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/nupositudusepug.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/ponip.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/luvad.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/84031345023.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/vasadewasoresamofej.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/5f68c7bb10453dba761369ef3a44b680/22294004878.pdfIn PDF document text
    • http://keacg.com/upload/files/xajiviremasanakapalaxej.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/81761935858.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/vafasitojunukumeweras.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161643344a76a2---wagedizapotawujalifemiwa.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/pedudatogoxawipix.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156e4e12f9bf---4611133185.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210902161214.pdfIn PDF document text
    • http://lovesenergy.com/file/kugilenigubatelosunogu.pdfIn PDF document text
    • https://taxinamdinh.com/data/dulieu/files/97917963175.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/63601779123.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2c1f0b642---72110871086.pdfIn PDF document text
    • http://theatergruppe-nestelbach.com/rogan/admin/fckeditor/bilder/file/87721633635.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/56413562353.pdfIn PDF document text
    • https://bczenekar.uleshuzataruhaz.hu/files/file/nezofolige.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/ligota.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109172310076773.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/vItLtdF7Pec/uplcv?utm_term=corporate+finance+book+freePDF 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_off0000dcf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF7 18388 bytes
SHA-256: 96b032fe16bdacbc788c9601b77a52bab3090e911f9ef23ded600f0ce5903d5f
font_01_sfnt_off00010bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12404 10520 bytes
SHA-256: 3d695e8ddc7fc5ba76b3411bf2c31f51725ea4bbb74e4ba30626f97895124b7d

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