Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdfea146c3838c65…

MALICIOUS

PDF

88.8 KB Created: 2021-09-21 00:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 77da20ff050022531789cb9699111c8a SHA-1: 54fb1b94d226c54ad0bb28311a8b9ac539167873 SHA-256: cdfea146c3838c65e69fb590bdd6f541b344dcf68f4b395b21737ce591ebc1c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. The heuristic firings indicate that this JavaScript likely redirects users to external URLs, some of which are hosted on compromised websites or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=list+of+offline+games+for+android PDF link annotation
    • http://bischofs-scheune.de/userfiles/file/42314235391.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/1429700557.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/49594296025.pdfIn PDF document text
    • http://savemaxint.com/files/file/labobenuwuribosaku.pdfIn PDF document text
    • http://freetds.net/userfiles/file/wetiretolabe.pdfIn PDF document text
    • http://halanmilk.com/upload/files/5108742367.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/xupofazopalujosudofexo.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/39243874064.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/xaxufirizilidanirixepek.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c83ee5862c---11257022690.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/34423325035.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/lenizebebalojut.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/ziligefokogunepibuxokus.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/69214013671.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67412045242.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/39426124928.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/saderokozo.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/jelexigotafazisulo.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090815461175.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/66613021442.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/2795949187.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16148fbf455fdd---26943863240.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/31224486550.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/26669973252.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8ea0c058b---41400500425.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_off0000f5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D6 18444 bytes
SHA-256: e35426cb13d9ea926b0cb3c29ebc8d51fa992286737549a4a13da80be295f6d0
font_01_sfnt_off000124f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F1 10656 bytes
SHA-256: ae81026c28f6f9a893bb50979e3129d08c9c0fbd3d3ffb23b436071f12e37722
font_02_sfnt_off00013d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1