Malicious PDF — malware analysis report

Static analysis result for SHA-256 de619356a660b859…

MALICIOUS

PDF

88.6 KB Created: 2021-09-07 03:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5b67dc888dbb2611299503725c391896 SHA-1: 61167065389202776e4cc1744121dcf4a5b5a519 SHA-256: de619356a660b85926c52158fd41de639479a2ff8046ce59a99e4006d8548972
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://negaratoto.com/contents/files/xigoxofunurulefevigi.pdf In PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/nimupoforezufopeg.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/wapupomekerivopisemej.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/pk97ggnvfsq919s9e76ncnusi1/damokazesuvalopoxitub.pdfIn PDF document text
    • http://nrnchina.com/test/images/ckfinder/files/solonutujitamatek.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8fda450568---nakimatav.pdfIn PDF document text
    • http://castel.lu/userfiles/files/parirosijogikapuzavo.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/53rsj8g9ghtfn7mdgubblfqf9e/61357308446.pdfIn PDF document text
    • https://telenovella-bg.com/files/werodari.pdfIn PDF document text
    • http://risme.vn/files/jujugerigudaluke.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083fd357d012---15299531894.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/63396189639.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/97153945865.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9ffea5443f---jokexipipalisezasugerix.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/tokus.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/jefuxogaribitu.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/47531528692.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/lutigowovojexi.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/xebusatenigarekogisapawa.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/jefekemalode.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867fd374eb8---toxuborogowutukide.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/ba1e76d2147f16a242ebdec41d6a3e2b/fegogubom.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/33201150649.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/mufizodededan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=intellectual+disability+articles+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_off0000ee9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9C 10800 bytes
SHA-256: 6e27b21e9f84ba667affdf56f4d36155a0567a771672a36258cc66b92acf7ba7
font_01_sfnt_off0001075e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075E 20432 bytes
SHA-256: 570f04b9a95e3c1a2f0bf04b8ab386b7f8f1e5c2192c029f3a38cd27690b5f66
font_02_sfnt_off00013cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1