Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1e60aee7e671570…

MALICIOUS

PDF

96.0 KB Created: 2021-06-28 11:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ef5fe1c557561080e768c6cd37f0e497 SHA-1: 4bf0877f39c06869acdde3716611d714f722be44 SHA-256: e1e60aee7e6715705b4b4cd55d749c3c4e66c1555c31393e51f2fb326ece5235
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML score. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the nature of the URLs indicate it is likely part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://birzebbugastpetersfc.com/files/file/pozopu.pdf In PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d8b825e96---19133946230.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/bofiwuwi.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091705179492---15547992964.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d8b82001a---muwawunavavafazu.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c352e86c00f---tixenasulux.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14a6c9cffc---newomibutuzafimokowiket.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/ouh9nufo7k2pqs7gns16itu0fp/69653011772.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/33162466430.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/zuximijigeladozoburuki.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/reladaduzasewekikiv.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/riloxapogex.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/lolakegujopijuran.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/f06fcc14d2eb561b3447972ab1183366/47155975460.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/3f1ea85b03625a6df992d64cf8e7d980/17359665844.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9357c51ac---movugaxutemubesana.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/merujofo.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/fdd72277523bb68a714a1849aba70175/nerafase.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/cc15843f0e58aa2cfdb59a3f5d3ae4f2/56655013333.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fc3a5532f---jegodorexavawuti.pdfIn PDF document text
    • http://lyshiying.com/d/files/17986421172.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/botagitiviloxuliw.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/46800489019.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/61480850974.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608831a2b3d13---zulavex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=feeling+bored+and+unmotivatedPDF 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_off000112cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADE 17508 bytes
SHA-256: 135c11d9d990f2deef63fb44eca5c38eeaeb8ab47e8735cc36de388159b85ca0
font_02_sfnt_off00015893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15893 10704 bytes
SHA-256: ded6776f9636e5f60d8f1b0d3a6dcfb1c3f9b6b2645325eba56d82bca1819164

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