Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb347d04bc9e171…

MALICIOUS

PDF

84.5 KB Created: 2021-09-13 12:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c76d722be0ce9853a7a0950817df5d13 SHA-1: 41f2ef37f63c8e79a425dbfb8b664f5e349e24d2 SHA-256: 0cb347d04bc9e171aba393cf99e160c6a266f4af125f55ed9494a58f5852a0f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, aiming to trick users into downloading a fake Adobe Player. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chrmglobal.com/userfiles/file/59255634570.pdf
    • http://german-ex.com/images/blog/file/16127249543.pdf
    • http://mprime.net/ckfinder/userfiles/files/kenojafavedetib.pdf
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/pakopojet.pdf
    • http://telegid.tv/userfiles/file/givitakakoteranojinoru.pdf
    • https://cryptobasics.biz/uploads/files/29791039762.pdf
    • http://futimisdev.com/userfiles/file/geduxewupixasokapeda.pdf
    • http://nhatrangpalace.vn/app/webroot/upload/files/fasagelokuxadopikafoxemup.pdf
    • https://movingalpsfoundation.ch/userfiles/file/balunefukatukij.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a093c7827a---42547364319.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d24694d8b---31332433921.pdf
    • http://sattosushi.com/uploads/files/88256056357.pdf
    • http://lejonhund.com/upload/fimowesakefekuk.pdf
    • http://bilcafe.it/userfiles/file/38024290560.pdf
    • http://aliguoriarchitetto.eu/userfiles/files/88087895584.pdf
    • http://opgzvh.hr/upload/file/59720619772.pdf
    • http://lltsg.com/uploadfile/file///2021091205242615.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613760ac7b9fa---7682001459.pdf
    • http://vanhacollection.com/images/files/mamidamasagekej.pdf
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/49920997086.pdf
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/jidarutibejenurira.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=download+adobe+player+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf1a.bin
41ae6d857190ddb1b62611be25c2cedb8a4c999cfa9cb96c9158103d96377404		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1A 23640 bytes
font_01_sfnt_off00010b8e.bin
76bf5a6eb185e91b94ce7f39d4d98761847daf664ab8fe472ed08a58714c4328		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8E 10568 bytes
font_02_sfnt_off00012383.bin
ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12383 1820 bytes
font_03_sfnt_off00012c0d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0D 16792 bytes

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