Malicious PDF — malware analysis report

Static analysis result for SHA-256 bde9b6f909f0a3a7…

MALICIOUS

PDF

74.5 KB Created: 2021-09-13 22:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a30e0f7dde69e16d8c7c2323db8a0828 SHA-1: 9011eb1fe0237a5efffd156af856f4090f13ad70 SHA-256: bde9b6f909f0a3a78e88a19ebdc92b4dfa9a67739874572e60a0be599ed2063c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to various domains, some of which are hosted on compromised CMS upload storage, suggesting an attempt to distribute further malware or phishing content. The presence of embedded URLs and the nature of the link farm indicate a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://interstudy.net/userfiles/file/58952405672.pdf In PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/85307192154.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/90055222282.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/rutobubalufivusizu.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f83a198a7---67800770646.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/69762810248.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/tuzumuga.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/zumajizaguxinerewisotumun.pdfIn PDF document text
    • https://durimawar.com/contents/files/93695166923.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3edcbdbdf---28902052391.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/jopebilifatipe.pdfIn PDF document text
    • http://guide-eq.com/userfiles/file/20210909230228_4b92uj.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/35235427186.pdfIn PDF document text
    • http://bluebossa.pl/files/file/guvepega.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/72117388007.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/fajakux.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/b32700185191f2de4da26599ff4f10d4/3944801063.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/51181977823.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/zawaluzewad.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/031946246336.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/xowufobanef.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/junuj.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210909075044.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613924fc3261f---37926178124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=episode+hack+mod+apkPDF 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_off0000be13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE13 10508 bytes
SHA-256: 2a79c0d663f1908b58a6a2daf18ab88bbe0feb659f8eac179ccaa366e2330bc6
font_01_sfnt_off0000d5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F8 17760 bytes
SHA-256: 640726311bbf946374a70fce3a3763f28cfd3d69cdca1038f6dce2419542f2d2
font_02_sfnt_off00010461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10461 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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