Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ec5739c1e0a126a…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 18:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4741e5d065c7d2ef7e223ae7db3c135b SHA-1: efaaefff2975fb91ce2207529638016b7fc0621b SHA-256: 7ec5739c1e0a126a3e056121bbcaab6deb9174c9f18b08bc0dc79328a7c3514f
184 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and multiple URLs pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are presented as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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.
  • 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://chcial.ru/uplcv?utm_term=view+stored+wifi+passwords+android PDF link annotation
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed63bd83a3---xosebalukalomiragogogumi.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/tuted.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/fisazifalonebidor.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/lorakajexoso.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/dc36c70612c88553c137155c057edf89/zakokavovitipazuxe.pdfIn PDF document text
    • https://rezilta.com/psum/admin/userfiles/file/7801603535.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16137ba4dce999---70039349405.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/31886317832.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161382ab3eca4f---52711779780.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/kilorupab.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/ferotarituvo.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/29799229860.pdfIn PDF document text
    • http://fruitvita.com/files/files/joxogofudud.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/23959965675.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/gatupibixoxedimi.pdfIn PDF document text
    • https://nexapos.com/upload/files/5876250344.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/78221013300.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/78387208252.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/83872678570.pdfIn PDF document text
    • http://skolky.info/foto/images/file/40363043830.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/dejuxegaxijevugenug.pdfIn PDF document text
    • https://cooperspick.com/files/28056159583.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/7ccmchk9i5vfu0tro5mnolkqc2/pamesikopigejupusi.pdfIn PDF document text
    • http://arsvet.ru/img/upload/xanaxikivimukafar.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_off0000d47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47B 19528 bytes
SHA-256: 2aaad841366530f5ada83f024dba3b6e82048b7e2173ac3d619fe96d4e24db09
font_01_sfnt_off0001078a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA1 10500 bytes
SHA-256: c676433665908ad32358e00942e0d71864e8d5b0cebe917b09022c20e3ff1198

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