Malicious PDF — malware analysis report

Static analysis result for SHA-256 eebeb7bb83aef528…

MALICIOUS

PDF

84.7 KB Created: 2021-09-19 10:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 98adb50a08f3a00903b48593ddc2c02d SHA-1: 874a1ddce62513dee0e04a01a3ac361ed48e4a97 SHA-256: eebeb7bb83aef5280bfe711b0e56b3961a2f5b4e569667c6fff840542abd9111
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, pointing to compromised CMS uploads and disposable hosting, suggesting a redirection mechanism. The 'SE_URGENCY_LURE' heuristic also suggests social engineering tactics were employed, though the document body itself is heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://sbs-group.co/userfiles/files/23774978488.pdf In PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146dc8077a49---36596299299.pdfIn PDF document text
    • https://tele-video.ru/upload/files/sujeburewi.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/velomapifavitigi.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613bba8aad12e---4029714843.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/jufapezo.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/patufozage.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/11745765256.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/53133078364.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/19985778977.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/pimomuweka.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/kusemubinefikijupe.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161454d92a8de2---55801392390.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/13442f814762c0959531f91e33531b09/72829620575.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/50845838735.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/f393d9a82aa0909515be8c2ef22048eb/31723181868.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ee14026cc53394a93d953a64e2a67903/52466959691.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/tuludededigazebejaguj.pdfIn PDF document text
    • https://cakkue.com/contents/files/miwidet.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b95e275342---jixalopopetajojurukow.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161412c0216e0a---wulokazukijirakusob.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/gifonerulazisujep.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sizikudipubovodorovut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=cctv+monitoring+app+for+androidPDF 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_off0000e713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE713 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF25 17800 bytes
SHA-256: 502dec9c4b93abd40a55a25fc64acd4cc5757d568d615f2aa67ac8f644df5478
font_02_sfnt_off00012ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE7 10716 bytes
SHA-256: 75b81dac61f954be9a83a11d98efa0fb89723a0f77ea0e2a714e1b84b1714f9a

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