Malicious PDF — malware analysis report

Static analysis result for SHA-256 46c3e8884e2f987c…

MALICIOUS

PDF

88.6 KB Created: 2021-08-21 16:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e6fa30c8b43af47fc58024af3909d0e0 SHA-1: 522be46b95a2a8c134ac1ce1b7ef1b3355b4ebfc SHA-256: 46c3e8884e2f987c6135b5d2f53100d302c155b472d86a9e26b51095cd404846
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous URLs, many pointing to disposable hosting or compromised sites, strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://augustaelectricalwork.com/editorData/file/vibevowemijaj.pdf In PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/72287695279.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/74031578218.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/vofukukef.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/f9456cafc94ce3384a1e59483a6e3a21/sepade.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/i0j354sqes65ek06p6n1cntmjq/1874820525.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/13252811817.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6bdd022e7---lusefumorufibukalinute.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/5625489005.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119b2fc137c0---24116437957.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160811066e184d---mazafigaxe.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/rejewaxerolek.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/4317393835.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/nejojesuposulip.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/zironafimi.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/24567956252.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/87639810899.pdfIn PDF document text
    • https://2acontractor.it/images/file/60931920343.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/48949714881.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/sixazubenunevuwavelebu.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/60841136730.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/bevujisilibe.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb4434f32e---54722350746.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fa33a5f91---98300946620.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+do+i+get+amazon+prime+movies+on+my+tvPDF 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_off0000f378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF378 17932 bytes
SHA-256: 2b8ab4eff9f08be9308b63cf1570daee015187791bb2ecbcd2245d5c4a5e63cd
font_01_sfnt_off000122a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC0 11004 bytes
SHA-256: e0ddc7178aa933ad24fb4b74775c3eb791854785c11c05f30335628b0a03cf81