Malicious PDF — malware analysis report

Static analysis result for SHA-256 b26b1c156db0a8a5…

MALICIOUS

PDF

84.6 KB Created: 2021-09-09 19:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2d6e5358fc3cfdd65f6d5f604267cff9 SHA-1: 5e600b09ddd079250ad31265bc377d73b6e72d4e SHA-256: b26b1c156db0a8a5fdacc6bbd7ab92f4d5c071f9761ce0f19e80ffbf6bd3fa19
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. It presents a fake CAPTCHA or download button lure to deceive users into executing malicious content. The document also contains numerous links to compromised websites and disposable hosting, suggesting an attempt to distribute further malicious payloads or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://ewtch.com/upload/files/taposuvuvikofofax.pdf In PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/86257506412.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/99051986911.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/83898167347.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/ramodoretagoxaladetem.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/90965473077.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327defeecd3---16474447484.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/202198167397105.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/jidifujuwa.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371ac08539b---bixaf.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/85712928103.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/riniraxevo.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132b6815cc04---fubidaruvesizekigiremedon.pdfIn PDF document text
    • http://airsoft1.ro/files/file/jedopokilorekipawuwax.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/lerujapinidadew.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/foziwelumenemobadew.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131d4831081c---kenifaki.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/95470940918.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/rujetef.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/mefapajulepopima.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/18898733790.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/joderarejepenage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=ez+diamond+ml+apkPDF 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_off0000e73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73E 17944 bytes
SHA-256: 7e75a683aad99a51eb6024545cc48813938d44d7f0bd2253ec9a984d807b93fd
font_01_sfnt_off00011643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11643 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5A 10188 bytes
SHA-256: b94dc0bf1901098053665f57fab1890a5eb698389eab8c98dbf1a4caaac3d25b

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