Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2258619aa9cef80…

MALICIOUS

PDF

100.3 KB Created: 2021-09-16 16:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4aa04f3357fc5b56c0ca1009ed2184e1 SHA-1: 0dc0f8703b2aaf474eb744b260ff96bd22a93dd5 SHA-256: e2258619aa9cef80e58498e96ee0418067baa2a95aaa0cc3198a720b877128b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and other disposable hosting, with numerous embedded URLs. The document body is unreadable binary data, suggesting it's not intended for direct user consumption but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://synerhu.ru/uplcv?utm_term=english+comprehension+for+class+6+cbse+pdf PDF link annotation
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc697b6d0d---25773989627.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1631201531.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/3667795797.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/bukopelugovetu.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/38224542462.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140befe9e779---51821734933.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/rumawudejovu.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/wixixu.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/29767691430.pdfIn PDF document text
    • http://change4best.ru/upload/file/wukovat.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/puvafusez.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/11714417291.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/kivivezujukuwizelokaxuzek.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/ab70f3041fa46d87da8705f886b1663d/81577071368.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/toxuwomibapitujiwinok.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/lekur.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/tisifefuravetofakifuja.pdfIn PDF document text
    • https://htchninc.com/d/files/senofalojifaril.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/63633329053.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16130a129a5a77---dekoda.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/regigitojakepit.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/14559936801.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/7625e133c80932b6586ba0141b7bf5b7/74495193154.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/71106069525.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/15/jazixupolenawaf.pdfIn PDF document text
    • https://contabilidadegoncalves.com/fotosempresa/files/11638691831.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_off000120cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000138e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E2 11260 bytes
SHA-256: 0d5a3fbe3a0a575f38f881d0cf5b487629a0c3591871e45746edc72b443956c6
font_02_sfnt_off00015298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15298 18804 bytes
SHA-256: e5149ce9669a8bc9245ce2f5404e8987899c9910d45581e47b5f197cfb98a305

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