Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d3bf259a5aa2427…

MALICIOUS

PDF

78.6 KB Created: 2021-09-02 19:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 56b06789baf4dd46c89223f399cb2f79 SHA-1: 004eea256021a6add3435bc201d2deb1f26bcc3d SHA-256: 5d3bf259a5aa2427ca69c34fd5ede9fdb8a18fa3659eb86a79887964d1944b15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised websites and potentially disposable hosting, suggesting an attempt to distribute malware or engage in phishing. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ppuhperspektywa.pl/files/edytor/file/69129891145.pdf In PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/88503872371.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/77631494776.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bbb17e11f---44553640239.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/7dpa80ttbpv18go4j1qkkcg04v/remavozazejedaturepe.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/darowikuk.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210609192732.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1610e7a3b50364---soram.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/f7fc6fb8029d107c3cc2cb866ce49b4f/57647295314.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021073022320273499.pdfIn PDF document text
    • http://princeverma.in/uploads/files/mevutepeju.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608f152540885---kemale.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f67fa682d1---66877261761.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/mupuregumotazufixat.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/06/21/file/63045516275.pdfIn PDF document text
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/54503343984.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fc94fd1c56e---roxedasawifo.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/jerodo.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/medafekiji.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/lunenumonowetamotafixoso.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/60783551382.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/nntsm793vutn1fpsvqqglp5jj7/46477087837.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae084c312ab---44654929662.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/diratumujegafuloririborup.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/pekosasevepugokamobekomo.pdfIn PDF document text
    • https://morabia.fi/images/file/vijinufivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=noli+me+tangere+script+free+download+pdfPDF 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_off0000c8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AB 19276 bytes
SHA-256: 1d85bdeae30bc6c86f66af22612872657b90b09c3a3a7807c875e57bf174c759
font_01_sfnt_off0000fad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E8 11024 bytes
SHA-256: 723c2728145ca4f2a2c4181aa2658b3a492889d7ad778fd018be35da6e38cc1e

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