Malicious PDF — malware analysis report

Static analysis result for SHA-256 8696884f4ec39260…

MALICIOUS

PDF

73.0 KB Created: 2021-09-16 20:36:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d4a691c234242717ce36ec3c565a8f3a SHA-1: d77e904fbe7c9ffda342869989ad0cbdf2220f9c SHA-256: 8696884f4ec39260f32111bf2ddbf3b0a6eb18842a3ca94bcd26690be5ec07a3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting, suggests it is designed to redirect users to malicious sites or download further payloads. The file's structure and the nature of the URLs indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=android+read+csv+file+from+sd+card PDF link annotation
    • http://packturf.fr/files/dabisofejokixapul.pdfIn PDF document text
    • https://thepainter.asia/upload/files/44361450312.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385fbccc242---16187991704.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/4553619378.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/4792064f7baeb490cb1253898318a92a/daximib.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f819ad0ec6---55769270565.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/vuwirubawibaro.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/9550782123.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/mujizalekofederosevi.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/pasigodonu.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/46743220941.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/57575470432.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/fasitulukagurebeluno.pdfIn PDF document text
    • http://alltechsro.cz/files/zisimawizabixuvexeluwu.pdfIn PDF document text
    • https://satesayap.com/contents/files/44412620702.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/e27602581a103ea22a12d197a20f347e/35471148659.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/warigewajevo.pdfIn PDF document text
    • https://umutfm.com/resimler/files/96326093061.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/78896306944.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109081805125813.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/24058975614.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131596d74b0a---vizoxikip.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/vuzagijorawetipije.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/24279712235.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/wexunizufizanazalaluz.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_off0000b9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C0 17196 bytes
SHA-256: 16cb88aeb8e11d525bab5f7bbf541e84ed66aa6421ecfdbd11ec2efd9d777998
font_02_sfnt_off0000fdae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAE 10588 bytes
SHA-256: 0ad3856c1b37727ba095a6508f9f0c84200146426926de31e59b1075a2a6f9e6

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