Malicious PDF — malware analysis report

Static analysis result for SHA-256 d04c9518d3db1a24…

MALICIOUS

PDF

73.1 KB Created: 2021-09-07 12:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e6a76234b00f3e4aa02e34dc99feda0b SHA-1: c63392cc344c98d8caf24a408bb1b51cd88c86f3 SHA-256: d04c9518d3db1a247f6f27b014182128a4f1ff788896745ef506a8f777187ce2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to lure users into downloading further malware or engaging in phishing activities. The presence of external URIs and compromised CMS upload links suggests a tactic of leveraging potentially untrusted hosting for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://medvor.ru/uplcv?utm_term=derivative+of+hyperbolic+function+pdf PDF link annotation
    • http://botosani.ro/img/uploads/file/gamuxiwagexopirasomog.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607125777e9c3---taperutakaxixosaroxufis.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/a1d573fb67ef4d3a793c1c3ad27aca95/luxalejagasuza.pdfIn PDF document text
    • https://onlinendttraining.net/files/jezabagerelepunevisubug.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/423011677cdc8b6e1351b131e31b00f5/lopujurusaxuwiwopate.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/40130959177.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/26120af78c2e29600f27e59470bc9fa4/pujafasedivopileb.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/69284075123.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/pefujipemojamejovifefu.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/f05af7ba0091eac3a9201b3c221136b1/liwikarupojubape.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/nafakusiwu.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/nezofivoniwivesu.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/6379241437.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/3928035000.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac5dc7f88c---17153033650.pdfIn PDF document text
    • http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/rijukanelefexat.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/44774259733.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/07e6a1fec37112bd5abb1bcbe396fede/jevojavixomepebupafudase.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021052612090770554.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/gogujusakojolimaz.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/68436649801.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/18229725198.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/8f61c2c0795c6757ca846427c57d8a40/jepomaverer.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/rumutozekojuxufokin.pdfIn PDF document text
    • http://babamoleskine.com/files/file/fenuvoxopexoguzobimajal.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_off0000baa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA6 16756 bytes
SHA-256: ead62e7aee4a9e952fea88b25d982ef26670f920b1835f4aaf2fed3a15ae052d
font_01_sfnt_off0000e59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59C 10972 bytes
SHA-256: 43769d28ec854fab236801c1a20355994de4f4c61633680f9396084222f73471
font_02_sfnt_off0000fed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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