Malicious PDF — malware analysis report

Static analysis result for SHA-256 5099dc064af6530c…

MALICIOUS

PDF

74.1 KB Created: 2021-09-02 00:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e6ac955ca3d9c993491c16831230f4d9 SHA-1: 45bc84bb6a89fad79d59859a01770d0e14c50812 SHA-256: 5099dc064af6530cab34d4d6649e82fc5508bc4880cbb08ddc7c7457d7815829
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other potentially malicious sites. The primary purpose appears to be directing users to external resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb2eb66349---90200514107.pdf In PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c10f037fc---22575460468.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce28077eec---ganudizemujiwoboris.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/sujarezibexezexefavi.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/78246000676.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/6f794de76f02ca0ba533ec244338aa6c/poxagarokikewobegebiwaro.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd14e77781---87931608569.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/niwex.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210810_2C362C230A9FCEF1.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/2d260a22806ffae1b9257c8466bd74bc/podero.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608816283cf41---5010303306.pdfIn PDF document text
    • http://meta-min.com/files/xaletobudafasewemunis.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/55068554209.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/36206962682.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/beginedagupuwixila.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/40100681987.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32163147685.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764e08884aa---85157445079.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6b2f3db5b---zumijuxexoxira.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/89192478749.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/fumuvesisetizivofu.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b43c0b54cb---49028959813.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/nonavunidabifux.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/44212369280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=occupation+exercises+worksheetsPDF 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_off0000be55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE55 16288 bytes
SHA-256: 537667ca88fd11165d21f76bc2399341c57a7bb872fe6ccd5b206ef6c472dcc2
font_01_sfnt_off0000e818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE818 10832 bytes
SHA-256: 8cf40407d64238ace1d7a2e552bf9786a5147be0ee94cf0a94cbe7446b8b0688
font_02_sfnt_off00010133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10133 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1