Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee658ffd7dddba0b…

MALICIOUS

PDF

83.7 KB Created: 2021-09-07 17:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8d30e96dd9cbd456bfd089cc3cbb13cb SHA-1: eea876f3ec9364a27ee31118d6c9935046bad885 SHA-256: ee658ffd7dddba0bba22eb673730d95953ed05987238a00ec75571f7e71b3b5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=prestressed+concrete+design+mk+hurst+pdf PDF link annotation
    • https://journeywithmypet.com/ckfinder/userfiles/files/27270168158.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/3478287975.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/52652027347.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0eba79ab4---xesudibasagaxanomozosagak.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/64228421486.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/45619731063.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021060601554973499.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce5567b218---nawusodakupofozogibinokor.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/gugizazizodatajura.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/jadepowatojukiluroza.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160af70cebc0ed---52517827689.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/naxetisipubotuvufidel.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/4560814986.pdfIn PDF document text
    • https://topaldanang.com/uploads/image/files/77047313591.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160bd96b15f3c4---54987103902.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16129cebc427d3---72233644708.pdfIn PDF document text
    • http://toonesk.com/upload/22577469993.pdfIn PDF document text
    • http://hghs61.com/clients/9/98/9814c5f28b4e93efd1f74733a9fd6b0f/File/diwutij.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/depoxojowifawirabekuserik.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/xuxekuwidanatap.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/86287068828.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/memataxezaz.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3b766cede---wutirikalogulinavowif.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/netitojuwera.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/26e9d957ee902736e01254d5a8ff10f9/85462423033.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_off0000da51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA51 20076 bytes
SHA-256: 2b04d88efc9ca408bf2e78ae304e92d5558069cd54f1696d9414c78191519685
font_01_sfnt_off00010ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF8 11052 bytes
SHA-256: 3d0988199d43ab57eb8f0a98c576ca68ec98a62c646e5734bba09382d414a2af
font_02_sfnt_off00012859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12859 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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