Malicious PDF — malware analysis report

Static analysis result for SHA-256 9985bcb5f49cde04…

MALICIOUS

PDF

76.9 KB Created: 2021-09-12 12:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: d9931b679b4a67a6c123f637eadc94a3 SHA-1: 8033ab25e41200725c5f61b154a79d67338a711c SHA-256: 9985bcb5f49cde04d335594b19cb20a835db6efd4119b962cb592631f24e2566
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=walk+in+hair+salons+near+me+open+now PDF link annotation
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/ronagaruwuxobagasakujuvez.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090310112359.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/xenadenuri.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/578ac69da985d3a3ccdf49eccfefa523/24356237928.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/1357750525.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/sofosavisewef.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/4b9760736244bd2884f3ccfbd379358f/kurikiludagaseboguxujideb.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdcefa3327---60867488161.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137aed1735f2---95688194516.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109020554171370.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/56286093383.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137fb9d76ed0---poduvakoka.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/5883948ca22dd4bfda4fe0103d1608cd/sunovu.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/tumuvotevagugobosupu.pdfIn PDF document text
    • http://travellerisland.com/files/44583735397.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/7318613537.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/31129500899.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/xebobajukutiwus.pdfIn PDF document text
    • http://okun.su/upload/file/23044843354.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/taduwenige.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/46647238683.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/35511638311.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/73951244767.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_off0000c4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DA 19056 bytes
SHA-256: 1eeaeed619914844b61c88b8968462e1320b442ff334e50b442b49a30dac39e6
font_01_sfnt_off0000f633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF633 10592 bytes
SHA-256: 3fe941e694d49aba837575e212a70595e88e07abcb42da18383d86f7fefbf87a
font_02_sfnt_off00010e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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