Malicious PDF — malware analysis report

Static analysis result for SHA-256 69fe83aede72492c…

MALICIOUS

PDF

70.2 KB Created: 2021-10-04 04:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8f1fcd658a6f84ac2856186a32157ea5 SHA-1: 355c1ab8a1257aee484fe8a34c9681776be11924 SHA-256: 69fe83aede72492c7eaf9c65401c0e97b7bf31a6d9d5eb6cf9e736d387d8e423
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised websites or disposable hosting. The presence of numerous external URIs suggests an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

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 https://ph2020.org/ckfinder/userfiles/files/65461374930.pdf In PDF document text
    • http://sor1310.com/userfiles/file/bavake.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/gumemedixejapo.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/repewosijagiwubikisitog.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/pidenudesikafuf.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/563380303.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/vosumilupasovumek.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/83303993149.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/51110260956.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615040f147419---55809320028.pdfIn PDF document text
    • http://korytnica.net/data/files/mubukusujerobanejaxu.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/24165142974.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/midolefaka.pdfIn PDF document text
    • http://vps73.juicy-group.com/editor_upload_image/file/72436575502.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/jatododorafamelara.pdfIn PDF document text
    • http://spiregene.com/image/files/20210924_130017.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/pppikgc4oh8d838aef3d73bi44/garubagubomekotase.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/fixamoluvowuvugap.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/suviw.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/85533946648.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/butuzufapuwelevuzarusiz.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/84578163745.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/93213740133.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614f73bc8c031---37664837316.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/lg5k022490j9q7u5i2pcvfir11/godeferimusefojijusuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=being+a+womanizerPDF 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_off0000b48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB48B 15316 bytes
SHA-256: d3899b9d381a032857a86b40af33ca5c6bff7fa6a3772bcc96f0ea49f15aadc5
font_01_sfnt_off0000db8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A1 10336 bytes
SHA-256: a9e7df66240665c0eb88098f5379242c1107a6946ce282f75e7c7b703fe55f49