Malicious PDF — malware analysis report

Static analysis result for SHA-256 445e4673594c8fee…

MALICIOUS

PDF

80.9 KB Created: 2021-09-09 09:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cf46649b23b06c857f6fa737e0f5f671 SHA-1: 3c9d59662546dc0a218d47aed84d76956cdfd893 SHA-256: 445e4673594c8fee7ec513673ff422f3a9a872fc680d79f907ff75489fde63c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ketchas.ru/uplcv?utm_term=gta+5+online+gunrunning+pc+game+free+download PDF link annotation
    • https://wronba.pl/uploads/wysiwyg/file/47799349692.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/xonugonurif.pdfIn PDF document text
    • http://trieuduong.com/images/Download/19076270905.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/28043135650.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/56360512265.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/43156705336.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/didusinisajepepilalulu.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/zomipitogijimetejakogel.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/934c8a29ff954f8e67580c7ea91431de/66086077396.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/tevegadariregifuluxoxigo.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/49669784303.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/sfo6g4ksvmrhb85n1n7fh9udp2/61248451691.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/dotikizakosopewus.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/92202326431.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346ae22876f---58315988770.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/25337563448.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210906105724.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/63673508146.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/sogiglrnbfsbb570it1ob36273/14466419362.pdfIn PDF document text
    • http://stl-hk.net/userfiles/74680828775.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/24835673347.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/babowakikujezadajajako.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/di2v0kkeu84cjl6v6qac5i4q3d/92302601334.pdfIn PDF document text
    • 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_off0000d5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0E 17516 bytes
SHA-256: 78925c32b651225b497ec43597c7f09c31433aa01659359674627021b2901773
font_02_sfnt_off00011bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD1 11156 bytes
SHA-256: 93785ddec23aa06643c95aaeb4114a078d9c40263288cb8ef34563e0182939d5

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