Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2cad67067ea9a97…

MALICIOUS

PDF

77.7 KB Created: 2021-09-15 17:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0e1b90456b58cebeaedb090480842c5f SHA-1: e7ee9d40c3c61e82676a544d9e4173343c1d29ce SHA-256: b2cad67067ea9a9782b84e09dce24333e0cae249fb5b30c6ecd1de257f260ea0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs, some hosted on compromised CMS uploads and disposable domains, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing lure designed to lead users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://noithatmfc.com/media/ftp/file/lanoka.pdf In PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/dodobaduvobofe.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/532989121.pdfIn PDF document text
    • http://iphysiology.ru/upload/11331074680.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/83401122312.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133348a5d9e3---70176385652.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/23854717493.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/kutimumowonoruda.pdfIn PDF document text
    • http://imbirimbir.ru/files/zusofepefe.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/61652670a4431098ca8de7354e008032/jidivuramixejatatiwux.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/92966644054.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/zunonenorokasefewoxifo.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161410fe3bd571---tiwuxu.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-3/20210903152138725163.pdfIn PDF document text
    • https://jagominum.com/contents/files/jofigixawovelitag.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/jufesadizapufatabiravu.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091521482118.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/gebavevedisenevudani.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/24u0g8af3pi2h3q83mnkclpm41/tumamagidebiko.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/naralepevoxaroteb.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/37586470344.pdfIn PDF document text
    • http://topflexsports.com/uploads/56627702775.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/lusonelejeg.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/29233215924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=scatter+chart+with+linesPDF 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_off0000cc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC83 17252 bytes
SHA-256: 72149bd8379d3fc2e033ea2b34c9fe3cfad34af7a3ff850bd09923b67d31c747
font_01_sfnt_off0000f9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BC 10368 bytes
SHA-256: a9c11e9409bf2a5dc0c68f41ff48e88d7261dfb00045fa50a960a02a26d1a3e8
font_02_sfnt_off0001111e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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