Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb150dbb79eb1206…

MALICIOUS

PDF

69.6 KB Created: 2021-09-24 13:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 86dfaecc5641e7299e57b417d2cd6b28 SHA-1: 4a87703c65dce79b453aa122e552e5541bce536d SHA-256: bb150dbb79eb1206e5c31b87aa8bc97ce13f99f9f403e3a6b14f00f2639a23ab
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://satellietgroep.nl/userfiles/files/61188656001.pdf In PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/1691c0e65bf9b2d09d2351817bc0d2a2/zukefeso.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/rojelu.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/31030974240.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135db28023f2---15592360183.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/4c8939910f8cef61bfe2d584c9c18ff0/kodokafakosafaterag.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/leruxipadefizapepenofe.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/v0a0dl28hpirklsliqbdlhk50q/rovametamimalofelubig.pdfIn PDF document text
    • https://yasacompany.com/upload/files/baxopifusu.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/5add9eb6c20d2fdccf1ad7e22233e1c0/69797367394.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210915164341122.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/zipezopowatazibop.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/81341695254.pdfIn PDF document text
    • http://debten.net/UserFiles/File/31057229501.pdfIn PDF document text
    • http://szm.hu/userfiles/file/lovefudekolebaj.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/1175506728.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/fetigedolapamitenuleju.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/ruvelonus.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/56053528903.pdfIn PDF document text
    • http://netflor.pl/upload/File/63942144896.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/dazusakuvubaxuleben.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/70553320827.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/47726801858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=lords+kingdom+mod+apkPDF 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_off0000b278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB278 15436 bytes
SHA-256: 16803cbeab7f83f8571d267ef9521a221022d56a1bcaf73ebaa2cba1d30a7cd5
font_01_sfnt_off0000d943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD943 10508 bytes
SHA-256: 4cc02deb0a855d735095519efc112f8549a6a4c4c130fbd4f191392fa9f9e758
font_02_sfnt_off0000f0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1