Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7407e83b8fb3e54…

MALICIOUS

PDF

85.5 KB Created: 2021-09-13 09:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c2fea3f9c0cc7af2a26079119c0587f1 SHA-1: a5461f8a0025d781b1666a05d41c4d0a8fd3c12d SHA-256: c7407e83b8fb3e54dc75be622ad36c061dca8094bf8db26bdc6afdffaca9ac6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the URL farm and the detection results point towards a phishing or redirection attack, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613716cd6dc01---mojerikugar.pdf In PDF document text
    • https://anjingliar.com/contents/files/xuvosajekoxeviruxin.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/88270792870.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210913005711800.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/36354368009.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/67842191143.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/xifefibaledare.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/tezixal.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109121747138455.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/lasimob.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/94799002915.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/88452836036.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/fazeduze.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9d9bb2239---laxuniporob.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/66711529883.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/633f6ae1a82f2d2231860244dfbeeced/82628558662.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/zenumoxufe.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/subebivipedok.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/28237808043.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/eca2db5d18319f0767a1a6c9b984aa28/rufaz.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/deputozizupuwoz.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/kezugaridunololimosi.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/67366576631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=use+android+phone+as+routerPDF 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_off0000ea21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10238 10548 bytes
SHA-256: 230af8c008e285a57f009b9b863509a8365f8574fc989edac41bc5bf032bb653
font_02_sfnt_off00011a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2E 17620 bytes
SHA-256: 3ba52758342357585aa71afa9a64f0a5f4583f1261c5294e4d2100f69067e3ec

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