Malicious PDF — malware analysis report

Static analysis result for SHA-256 88bb15622848201e…

MALICIOUS

PDF

84.7 KB Created: 2021-09-14 03:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 52224ffa267ef53537b83f4719c2cd15 SHA-1: 8b9621462eb946a93f60147dace76c9f004ae555 SHA-256: 88bb15622848201ecc5dec749986ff8456e9e2e0073b265bc3b916e9678cce13
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document that contains embedded JavaScript and a link farm pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded JavaScript and the nature of the link farm suggest an attempt to trick users into downloading further malware or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://atolab.it/wp-content/plugins/super-forms/uploads/php/files/3e177697edc725fd887cdf69fc39ad11/zikosavasi.pdf In PDF document text
    • https://duproject.com/uploadEditor/files/tobibilajenig.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/77505154048.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/41212737488.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/vetazefut.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/nuzesokumufurepikof.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/83388728787.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/4110989335.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/86433174885.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109051247351930.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364d7f4e6b6.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/82543380062.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc8489199d---47142706985.pdfIn PDF document text
    • http://sung1.com/upload/files/vifesadorosovanuketodi.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210902090514.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/7425552988.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/tajurelonoxugepiropi.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/44215168207.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/700f5a2ee6f5c517db8c4d3b048250c8/52161952964.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/goputakulefexevufoxuzam.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/wejuvumekipovupamoriv.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/beponenipobos.pdfIn PDF document text
    • http://lulanjina.net/upload/files/xapumugubaliwobuni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=animal+kingdom+season+4+123moviesPDF 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_off0000e83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83E 10952 bytes
SHA-256: 811f2d9d4f0cbb652e5c64d4976ac492424fd0be6ae49cb9908e019579de4df8
font_01_sfnt_off0001018f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A1 17536 bytes
SHA-256: 79adb3a107eb1011efad0e5855ec70ff595e65adb8a7d2de41d86203494d001f