Malicious PDF — malware analysis report

Static analysis result for SHA-256 b846c4df679d07af…

MALICIOUS

PDF

69.5 KB Created: 2021-09-28 19:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 14aadf64cd221007b9b4c6e5c7583983 SHA-1: 31bbe9ca0ddf1316bc3dea5385a164dbfc2b37dd SHA-256: b846c4df679d07af239f667877cfe5c01f7d060562d2c34495530e8e171cc1c7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://synerhu.ru/uplcv?utm_term=screen+recording+in+android+with+audio PDF link annotation
    • https://biocoils.com/img/file/fizavoniwawajufule.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/dce4ce6a003eebd3937d8694d65eaae5/31207625429.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210903_163039.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/tsth4ab2cfh6vlufr0llielm2l/dipezarozubotobojil.pdfIn PDF document text
    • http://marketingnews.fr/images/file/49588739448.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/numonelegubozumepafasixit.pdfIn PDF document text
    • http://jinyezi.cn/upload/46049251472.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/kebaxotomevumakozelor.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/161323a2756d1b---22753646305.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/zatupuda.pdfIn PDF document text
    • http://rentaruedas.com/files/others/27605179865.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/gutonajezuwanawav.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/77718093038.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109241812182097.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161334a7799801---54600099476.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/60566984201.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/18660082921.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140272e12c5a---1694709003.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/69941430752.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210914183136_eg1fby.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dee9380c1f---88710762122.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/rumimezibebada.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tafijuxi.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_off0000aff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF0 15776 bytes
SHA-256: 068477bfbeaada55fb930f2f7bec8c0ce62983124e790b77c8e5a93e376ddfa5
font_01_sfnt_off0000d826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD826 10696 bytes
SHA-256: 8f24ca302b0587276fc993e2f42d672f2f5636478691c2cc4fe0de6f4ff278f8
font_02_sfnt_off0000f084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF084 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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