Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73e3d00f9c9de18…

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 14:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e3bafbe8d9f75e93d30422dcadd77adc SHA-1: b832d9cac2485a46659812f76c8828db4a6df7f1 SHA-256: f73e3d00f9c9de1822bc7a939eaa858c43782aff3bf0043467cfd728f55ef59a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, a common tactic for distributing malicious payloads. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to decrypt a password-protected archive, a method used to bypass gateway security. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to facilitate the download of a secondary malicious component, likely a trojan or phishing executable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/b616a4c5fa61c52411166561d915b423/nebijubafodimezenekomipox.pdf In PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210918163107.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/61720787386.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/nakatojaxesubibasazu.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7e8b1c5d9---91682418827.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/5835076526.pdfIn PDF document text
    • https://hiroyoung.com/data/files/nogemoj.pdfIn PDF document text
    • http://serting.eu/userfiles/files/46329032749.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/80848400801.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/kufuxenenizasu.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/10891979746.pdfIn PDF document text
    • http://ducnhua.com/upload/files/31768693326.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/gizewulogudo.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/d4212fd3ce8780256fc04dfc5016d7f7/15734642636.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/3041588380.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/32179613954.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/benolijezijesij.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/83179759691.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/27152389192.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/vibanulorevupipu.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/16845497332.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/faxunulule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=windows+send+file+to+androidPDF link annotation
    • 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_off0000d877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD877 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08E 10424 bytes
SHA-256: b0df45b2b93548d327b28196d4945bebaf82add15507e96a980ead931e5c6aa2
font_02_sfnt_off0001085c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085C 17440 bytes
SHA-256: 83fb491f9902b0125bc7fa72fe520d15078062a06751b91eed3edd72a50df9cd

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