Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8af194b5da8314…

MALICIOUS

PDF

94.5 KB Created: 2021-09-17 11:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2995914dad2d262474678cc608401e5c SHA-1: e349d914aa931233adbdb5904cb518d2c29713e2 SHA-256: ad8af194b5da83146fd8b846143356b9761ce3b51a5297473cb2bc32993d6a17
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable or potentially compromised hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using such sites for distribution. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://adsbudget.net/userfiles/file/pofarufirafilanufixuvot.pdf In PDF document text
    • http://abwhopewell.com/uploads/files/7899608913.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/84171026032.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/39954616190.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/kolegegezuxusabeziluj.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/nilagobevotim.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/fd8e3a7cea43e2cf13c5b974fb7f5d00/dikafanuvas.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd99d25646---65081863566.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/55719380134.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/nikuwuruwimanovosekib.pdfIn PDF document text
    • http://surausa.com/uploads/files/xerogawekozunakolomune.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/tozivegix.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/vonujoko.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/69470722096.pdfIn PDF document text
    • http://julianina.de/upload/file/46340649632.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/18027327887.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/gibilelisosirotuki.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/gosajagifarirexi.pdfIn PDF document text
    • http://crediramasrl.it/public/file/refib.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/konuwinatopivime.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/f539606cac4106abbc217232db251f01/41472681321.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/xuvawepul.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/sumenudizikowuzesidazoga.pdfIn PDF document text
    • https://arerp.kr/data/file///9222867566.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/35866388759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+move+app+to+memory+cardPDF link annotation
    • 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_off00010b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B25 10520 bytes
SHA-256: 66f50a9f097974a23805a0a32881618acae5a3becdbcb0960c2bd9706d355f98
font_01_sfnt_off00012324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12324 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B36 18920 bytes
SHA-256: 7eabaa9617495d43e446ff581d85fb3aac8b9f6800a599622292124cc2b20fa6

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