Malicious PDF — malware analysis report

Static analysis result for SHA-256 503879bd03de4a17…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 14:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 96b71263dfba87aadc7cdda02350c935 SHA-1: 0e1a93968fcc60d512ad9297a92171db032cdd07 SHA-256: 503879bd03de4a1790972121cbd66f05388dd24ed3274ba6061b24872a807e8d
212 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and multiple links to external resources, many of which are hosted on compromised websites or disposable domains, suggesting a phishing or malware distribution attempt. The heuristic firings indicate the presence of a link farm and a security bypass instruction, further supporting a malicious intent. The ML classifier and ClamAV detection strongly indicate this file is malicious, likely a trojan designed to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bsl-trans.ru/admin/ckfinder/userfiles/files/2666100822.pdf In PDF document text
    • http://metabolitplus.ru/files/file/2182421393.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/furidemokigimosomov.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/98805399436.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/79273038212.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed6fcd8b21---61164551102.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf089f1457---bumenolodalu.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/17173252068.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210910140815_sga7fz.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/gbvs9dldnso4eiorkta8c0robi/15509207270.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/80811039921.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/6585376411.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/ximewomasemijuke.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613310b16700d---molali.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-02/210902063500679422pc0xoee6bk2t.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/c9ca1cb9dc0dacd692fbfa81cdb04cbf/pirorimesa.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/aa9edc64951409d0223cd708744ed6a1/nulilajusonis.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/34206481782.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613e123e4dd3b---22185728597.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/biximabosujogiguwekij.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/lulasojisur.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/sijirofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=forza+horizon+4+free+download+apk+pcPDF 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_off0000d9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AA 10744 bytes
SHA-256: 8686d99a6c43de9bef36b38a1b5196b1d503393f9e0f7ef283be0234c1b1466e
font_01_sfnt_off0000f25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25A 18880 bytes
SHA-256: 14de112ebbad602fe17edd97c77ac01a0fedb2429dcf0876bc700a1a9b8e8396
font_02_sfnt_off000122cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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