Malicious PDF — malware analysis report

Static analysis result for SHA-256 553e9c414056a37d…

MALICIOUS

PDF

76.2 KB Created: 2021-09-04 06:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 98cb009efbcf27d711be2db718711fc7 SHA-1: ae8b96595823a690bc1438cab81d321995e534af SHA-256: 553e9c414056a37d19c1ada678c1668bc9d841078622bd9c09042751f50db9ad
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. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6a8ada235---zezevozutajatunadu.pdf In PDF document text
    • http://kayamedbursa.com/userfiles/file/12858885511.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/28912319876.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/neguruda.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/pamokoduwon.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1f9042353---64812139858.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b52fa76c0---38868217766.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b515e668c---32084150154.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/majabepoxogo.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/69889270806.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/57562795732.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/baretesexadimore.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f51226ee2c7967e76de55218bfab5803/7708729040.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/mofolezad.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773edc8fa7b---53236008791.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/pawilonixazawurisume.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/butuze.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/fadezinufitoka.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/41749593961.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/22071867079.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/bupudunat.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/megakuvebojute.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/58644942866.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=oracle+shell+scripting+linux+and+unix+programming+for+oracle+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_off0000c057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC057 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86E 11292 bytes
SHA-256: 4c0ccfb8c16c6a44aea4093a5c3fd1ca8498bf33361194fcc94e0a40441272ae
font_02_sfnt_off0000f29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29C 18224 bytes
SHA-256: 1d11bbb9112b4edfa05d7da089f5c994634f4d322fdf9e4405793d5e699356ae

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