Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed5315c152066bc7…

MALICIOUS

PDF

69.6 KB Created: 2021-09-24 23:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b9722ec88e4a58ccbed8d180aaf3a89c SHA-1: 213bb2ba69ad24d8fbd5cc3177be0bb57ba2470a SHA-256: ed5315c152066bc77b05181c0a54ad875c177c54215490a516b330815f897999
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised CMS uploads or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://smidgel.ru/uplcv?utm_term=reaction+games+android PDF link annotation
    • https://eastmanllc.net/ckfinder/userfiles/files/gexulefegizonaxedosu.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/53625506493.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/44872294682.pdfIn PDF document text
    • http://texmet.pl/userimages/file/20108513239.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be755ae3c9---32307109611.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/tegugibisovujetakozogura.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136315aa31e9---63542598431.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/witixupiviforuv.pdfIn PDF document text
    • http://wych123.com/upload/files/19574554703.pdfIn PDF document text
    • http://mamitobe.ru/files/file/68626165354.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/43230789359.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b85f569bd2---senufizivilokaxitosupe.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/31437123509.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/pefojituxopoli.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/67031864139.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/97751346807.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/f6355f74ef1cbf3074c1cae3ee6c3342/29155796543.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/sigowepononezef.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/wilivusonafas.pdfIn PDF document text
    • http://vuason.vn/upload/files/lumufudomupawefefuli.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/litojidewuwivetenuwimo.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/rusodikekuperaferi.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/xafonarigerumefafixumawew.pdfIn PDF document text
    • https://onecre.com/images/content/files/xiwopugo.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/jevoxenoxoxanigexiwezu.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/sofuzibunubomaka.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/11055521233.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/52507505238.pdfIn PDF document text
    • 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_off0000b39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39B 10712 bytes
SHA-256: 9b4b745cc4ba4e02ee2e465a22cd0675a448960a17bdd44d99eec92d86743eab
font_01_sfnt_off0000cbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFA 14720 bytes
SHA-256: f5d06b39df54b7f9ca84fb5bdd6f9dbb8484c8a2e184c836b86cdab40694fdf2
font_02_sfnt_off0000f0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1