Malicious PDF — malware analysis report

Static analysis result for SHA-256 845ff61f1924d58d…

MALICIOUS

PDF

81.5 KB Created: 2021-09-12 03:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 74c40d3800ff83f33839405d2ec58ba6 SHA-1: 6d4b2be4a502c7baa2532ddae5ff91821ef668d2 SHA-256: 845ff61f1924d58d18b6f270d724a3da9e609d6206aa3221cbb8a53995b72a05
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URLs, many of which are hosted on compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for further payload delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=gaming+live+motion+wallpaper+for+pc+free+download PDF link annotation
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/0dee0176139b8e595f845e6093960cdd/52811927245.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///nasudap.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/fitejenovo.pdfIn PDF document text
    • http://ipceurope.be/assets/file/gegipisukezonesadap.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135a46c20913---25494177571.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/suzulup.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/161336d7064983---32575634135.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210905_A6DFA9EFA8EEFA37.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/wafizumimiderirelerotujem.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/xepadifepedu.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/fejegitamerivevilij.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/dowajafol.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/makotigopadepevixo.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/18403969225.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/wipalikumatevexi.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/52535358337.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/kivafakafitew.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/61352205766.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/47776414259.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/97671243302.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/20219416639.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/8668565287.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_off0000dab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB1 10984 bytes
SHA-256: d3cfe6606f0c3efefaff5f4f6d87581d269fc31f7e74d47743f4eaa32e653b28
font_01_sfnt_off0000f40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40B 16912 bytes
SHA-256: 759b16e12a373cf49837010f10d000e54bd5ba999c57d2a7734c1988814c89e4
font_02_sfnt_off00012026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12026 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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