Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d1b430bab2309e…

MALICIOUS

PDF

99.1 KB Created: 2021-07-06 09:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8970b4306278cfc8ab6c2b5fcd178af5 SHA-1: df477d521beb606bad0227194bb552535c11e72a SHA-256: f9d1b430bab2309e197ff8dcba52aa0023185ba9e04670f1d64e91a18326def5
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with exploitation techniques that could lead to client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://cambridgekapurthala.com/damana/userfiles/file/53087485158.pdf In PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/d3opce24h4hvoq3dhkrv82k4rn/pubexamudopowekerared.pdfIn PDF document text
    • http://amdind.com/userfiles/file/dovaxigepudujadojodosuzet.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609079497a0b5---napukizejegijumevuwa.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/7hg7320sbi3hvps7ufkr1h5i03/sasivebafenezufet.pdfIn PDF document text
    • http://teaneckhs1977.com/clients/67867/File/sotexikudugi.pdfIn PDF document text
    • http://ahchala.com/img/file/51605569636.pdfIn PDF document text
    • https://cristalensi.com/public/File/salajoxerepaxas.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609417a2434da---bifobemelotelanumenexoxep.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/vegiduwamijogov.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/6e8e96f8857ee406f005a0864fd553d2/91199770708.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/b6d78d9a27dcf60a02a7a3358c93281f/60011955218.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/xiwilazunomipojevifepulo.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6a97f2d8c---80887579673.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6d5306671---zepidosepavimiraxijes.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/gezigafuluxotekeroj.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/62070168835.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/2f8f608d7d15ef64897767a9a6b0e576/34155856926.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bbd312c98---gezeguruzeseviwirewen.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba58ed76cb---nanojifir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=beginners+guide+fallout+76PDF 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_off00012182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12182 17244 bytes
SHA-256: 117a9b8b4f982531408a96ff136a5de8dc8e44213c7b81a09184e9a4de9c8ce9
font_01_sfnt_off00014e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E71 10900 bytes
SHA-256: 03983a4d2bd577563240560dc6d9ff47538403363512d1d9b690027a29b43de9
font_02_sfnt_off000167b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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