Malicious PDF — malware analysis report

Static analysis result for SHA-256 e183928b9669dd46…

MALICIOUS

PDF

92.2 KB Created: 2021-09-17 18:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5ba083405376040a1ff684b1be8626b1 SHA-1: 0615a5b390ed103f671813cc864d041dcdbf440f SHA-256: e183928b9669dd464af3d5f7410ea229c2542f94230bc4ee777ca7274a55e713
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://rugerwafers.com/demo/ruger/beta/userfiles/files/xemiwugulozenoruwewo.pdf In PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/botutixurufokugekawamodas.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/sanelodajugoladaxoxapezu.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/rijojudozavojusifapen.pdfIn PDF document text
    • https://bselink.com/userfiles/file/boxamo.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/natokarojugemobulefez.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/51194965011.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/40198890352.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/sj2vk3mof5s2615qb56gjnpcp0/buxetizutovez.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/57400590249.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/52665322103.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/78041420905.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/texijubegosirewasu.pdfIn PDF document text
    • http://myphamasia.net/upload/files/pilumevotixisozulinupido.pdfIn PDF document text
    • https://jetaime-shop.dvsportbg.com/files/3547561435.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/biriroresefu.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/48191123557.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/55882739128.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16139983107e73---savinibesililol.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e831dbce9---dididadagatosoji.pdfIn PDF document text
    • http://lgassociates.in/uploads/31999554407.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/90736045552.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/jonabopinepoba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=dear+comrade+full+moviePDF 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_off0001066a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066A 17496 bytes
SHA-256: ef8e168bd9a3e2340abca4697a356ad32261025831c1a37cc79495f2e7b595a0
font_01_sfnt_off000133d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BEC 10432 bytes
SHA-256: 095f8facb932b89f154ed0df35695cb6aa57150636487f2ecad814a6d7f214a1