Malicious PDF — malware analysis report

Static analysis result for SHA-256 c22cfe65e0e0aa68…

MALICIOUS

PDF

76.8 KB Created: 2021-09-18 18:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f033dcce93353198dc95d5c12c05990f SHA-1: ac4fc3134536eb868005174865402a274281ff00 SHA-256: c22cfe65e0e0aa6830c11b90569bd04c939c6c547e0a307b70b313b4126b2f0e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=android+ssl+pinning+bypass PDF link annotation
    • http://s8radziejowice-paszkow.pl/userfiles/file/12402491655.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/23260444465.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/guruz.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/danokoxo.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddbd305c4e---ditevekibeviduwixuxuna.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/66299866782.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf57b6d00a---84813382529.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/40562457439.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/85226594892.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/2343871210.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/93821601086.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/39460394383.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/nevukuraboxonox.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202194_1559_805.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/0d36924a4a251e94f975333a8c663f57/30599630905.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/7705304416.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_off0000cb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB47 10572 bytes
SHA-256: 70e24a5e5ae58ca811cfef217acbd15c5e467c6aaf01b300cb0cf7d3d956edee
font_01_sfnt_off0000e305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE305 16652 bytes
SHA-256: 6ddf36ea0774498617e7317949e26ef6fe3ff96fa4e5cfb6dc6a58a437b0ccc9
font_02_sfnt_off00010df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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