Malicious PDF — malware analysis report

Static analysis result for SHA-256 4489e57faf398cef…

MALICIOUS

PDF

89.8 KB Created: 2021-09-13 21:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6563d34a21f80b42d30e4bf18c782755 SHA-1: 4a833478c51ba848d994b8b7dba2b4cef4856e9c SHA-256: 4489e57faf398cef40bc6da9e5cafc3a95964723462d37c22b6fe8658ec7c9dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://clubon.top/uploads/files/95934995706.pdf In PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/789544760.pdfIn PDF document text
    • http://moretonassets.net/userfiles/sunijuxekavozetebufisu.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303036463bd---puzupiwizisuguxa.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/25093290999.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320d39d74c2---punikebozeso.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15973207139.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/41761670556.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/9ed8096368fa063cc903ef6928ad1c16/92124546322.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210906145321_dyvg30.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/65420114844.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba12c63877---11272637012.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/92786084336.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210910_EB77C7F4B4585C5B.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/xuvaxesowexax.pdfIn PDF document text
    • http://bastola.org/userfiles/file/68556700576.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613581002a1ae---refewuzixiwo.pdfIn PDF document text
    • http://esistore.be/userfiles/file/5027979399.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/75380475638.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/65696787699.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/6432330046.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/7350433855.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=last+day+on+earth+sector+7+modPDF 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_off0000f342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF342 10620 bytes
SHA-256: 4cecfd57520bd473f79641ad0c4f40a129845b0d36444967e0c2448d02583f04
font_01_sfnt_off00010b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6F 20592 bytes
SHA-256: b32ed3caf6cc01eb0bbc8252064273bdbf37fddaf4781fbedb9c4015f1000d97
font_02_sfnt_off000141fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1