Malicious PDF — malware analysis report

Static analysis result for SHA-256 33c6aa2a110f4eba…

MALICIOUS

PDF

70.6 KB Created: 2021-09-12 21:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a3cffbf2567111a30f0182ac4d66d067 SHA-1: 3560d65a7c56fb7745260acaaa5ad495a57f3a53 SHA-256: 33c6aa2a110f4ebac8482490ebfd5ce514d099ff01d77e6d53c6668c0144b0ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed for phishing or malware distribution. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/91053058916.pdf In PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/kukewupazetekonak.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/timotep.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136baf52c3aa---73717551371.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/fanub.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/12843795998.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/06/satifojugawubupar.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/voxefawoburifomesile.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/niwuzilowezones.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/94848374840.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/kidesaxema.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab8e88f652---vozosumota.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/juwim.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/welimebil.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/0db8994091ea8208de72a72397d8f9c9/todojesit.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47807255981.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/zuxeluzogetuzom.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/65161910084.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/rewejegufak.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/57986965171.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/22490381097.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/7887006518.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7f8578b4c---warefibepamiwilebuzigisiz.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/nupepekubinugi.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/94370672222.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=naruto+shippuden+ep+329PDF 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_off0000b3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD7 15596 bytes
SHA-256: 3858a7ec9a9dd57504a59c69a4721915b8a3eb656b621c47001279a8f5d3d470
font_02_sfnt_off0000f2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AE 10980 bytes
SHA-256: 3f8d147157c3964a1396e246e24a0c9d7e4a61e74b2436f997ceac50698aa9a6

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