Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aea70172113e24c…

MALICIOUS

PDF

81.6 KB Created: 2021-09-03 04:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 59b9ddbb48df48b50c46b9819077bfca SHA-1: 86c8c928b68ad4cb579dd083153c80c41e2e730e SHA-256: 3aea70172113e24cb1d7c91318d2ba4ebe1f1d40d807f3c06cd440c8355ca47b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a phishing or link-farming lure. The embedded JavaScript likely facilitates the redirection to these malicious URLs or downloads a secondary payload, contributing to the overall malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=standard+metric+thread+sizes+pdf PDF link annotation
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/tuxaziranedutor.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/seseduvojoxadukuzopigejar.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/wozovuwixadumaxavenobivo.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/4fd15c84c0251422f9d11c8e34b8f91d/levilizekivupepunawuzelik.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00adb21421---soloxeja.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/robabumaxozu.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a13f7ccd67b---94611899292.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/liludiroto.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/tofiragitigidubevak.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/20026206806.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/87eab3d90440f928fadddc9fdb2ce01d/jazivumilogosowaro.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/zamesawados.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/soxenewu.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/9301821651.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/vupelimolodul.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/maveluzav.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/45994090225.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/nudinixorasoxapug.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/21975509839.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc31624112---mokafetavunanapa.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da4a65cdf7---vimesufubadukoz.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b839bb43c54---73161906400.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_off0000d8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C1 18272 bytes
SHA-256: 221d7d728df0bafe81542841facdfaf456bf80ef4ef1365d081fb95c1b22ed9e
font_02_sfnt_off00012085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12085 10852 bytes
SHA-256: a194e283137dc8811578ca84b2d7e09a15ebc4beb375cf1db3587b19ac0c62ae

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