Malicious PDF — malware analysis report

Static analysis result for SHA-256 9050d4f56f369a5d…

MALICIOUS

PDF

73.1 KB Created: 2021-09-23 23:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9d0be96f2eaa411bc6e2e735873b0554 SHA-1: 9851086f0a2447fe00f37f63db3fa47a83289ffc SHA-256: 9050d4f56f369a5d4abb0f22c9a5afd7155c7c99222a4b8f339925007a1cd1a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded URIs are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://drafthe.ru/uplcv?utm_term=session+manager+android+studio PDF link annotation
    • http://bannermaul.com/userData/board/file/2349583981.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/838185339127dc18d584cf650a22d115/golopimofomefora.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/jebineludifobovapuvafav.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16143c386cb33a---zerumubigubobadol.pdfIn PDF document text
    • http://nemochem.cn/upload/files/47561511687.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/bugotir.pdfIn PDF document text
    • http://deauville.ru/files/file/radixovobijepe.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a371ac99a---gosizupavalujatabe.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/34834971748.pdfIn PDF document text
    • http://ellev.fr/upload/files/betakinixumosi.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/70211984988.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/72557695555.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5c69ac0b7---depixabovaxosixexenuxam.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/42978463938.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b239c51a4c---vejujulezuxoxepuzo.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210907212841637568.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021091710575911.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/defuwutakojivatiwisegi.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/44591664984.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/62017599172.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/22014841282.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wofesololido.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_off0000b2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB04 19152 bytes
SHA-256: 6bd0f11fc5219a644d0b0c4db7d31a933af5bdc1eeb0e1944f27ce5f8da60f02
font_02_sfnt_off0000fd63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD63 10720 bytes
SHA-256: cd7415581ec91efba6f9eee9f290b99f96719a5f181452b7b3553f43c7eda422

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