Malicious PDF — malware analysis report

Static analysis result for SHA-256 189c6bbee15c9945…

MALICIOUS

PDF

82.5 KB Created: 2021-09-11 12:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: db0bc0046602fea4147f058a65f16924 SHA-1: b4c6c3372c5ce3b8dcd1893b98180399a913a93d SHA-256: 189c6bbee15c994536b541a4aa65abe49dee30fd6dc54f5c7c475fa3688b1381
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam context, aiming to trick users into visiting these sites. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://drafthe.ru/uplcv?utm_term=how+to+remove+security+pin+from+android+phone PDF link annotation
    • https://strategie-forex.com/ckfinder/userfiles/files/fonivojerevobajivebalapa.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/91599742113.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/47008929959.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/resenigelekidad.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/gomoduw.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/rijuxak.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9816749115.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/jakudomugufe.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/terufikum.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/58958017315.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/jebavusagu.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161398c4f7f96d---1482799631.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/vigenolijilufake.pdfIn PDF document text
    • http://kvrhousing.com/uploads/29882291059.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/xukazatuxil.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/4f0f5b2f8b62dcdae4c38b7f0d2a5c74/vesidiniroto.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5a1d0da19---15806241548.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/jozopakitebuwosubogoz.pdfIn PDF document text
    • https://qnzar.com/files/junizesedazotipapubid.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/ripiwotudabefigigogada.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/43042964060.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109110808463466.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_off0000dce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE8 11196 bytes
SHA-256: b9f9a6e12179d710c3cfd98f7dd293a59cbf229916ff1822f7ab9d769d768cca
font_01_sfnt_off0000f700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF700 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F12 17296 bytes
SHA-256: dd4d48a22cb2500425528a8fecb8c9a75e1d9167f7b07720819ee4b19ff302a6

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