Malicious PDF — malware analysis report

Static analysis result for SHA-256 b581ce56eb56369d…

MALICIOUS

PDF

85.0 KB Created: 2021-09-09 11:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7937615401a2bc63344d47c0b11f14e3 SHA-1: d35f77632bb9ff3a3ddcfa40938a2632fb00c8e6 SHA-256: b581ce56eb56369d68034d39c18861e6e8acfa20358d42479e17ee6d3b730a8b
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=download+the+gta+v+mobile PDF link annotation
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346d0361604---tepuwakunotibijof.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/91772751610.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/13583196603.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/12317468048.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/lipobajozifubupewunupat.pdfIn PDF document text
    • http://vitrine-prof.com/files/pukosupetotebibevukugoji.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/zanemiket.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16130e4dbb96d7---50001683885.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/kuwokekasejulamurosevu.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613306660d41e---xuposezebesar.pdfIn PDF document text
    • http://aweibel.com/Photo/file/nalabajen.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/diwemitovogada.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/kofugewifewavolofixolelu.pdfIn PDF document text
    • http://otczenacts.com/media/files/mufagupaxetisokaw.pdfIn PDF document text
    • https://onecre.com/images/content/files/wonenabozova.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/savovowegatu.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/mavegazolode.pdfIn PDF document text
    • http://yanartextil.com/firma/files/54028856733.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/tukul.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/falozujijanawixunubi.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/36085284719.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631159521.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/xodabobaxoketik.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/81e4p31qe8f153kk9k429dpg96/70467571511.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_off0000e82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82A 10720 bytes
SHA-256: 7ddc6124692fa01a309524b76be54155be405d87c1fe2d1ff00b56fbeb1a6e01
font_01_sfnt_off00010058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10058 17624 bytes
SHA-256: 961695e59f0844993ffdc36ea92a7f9bb3f5135af85f9b9b17cd98db9c8efa05
font_02_sfnt_off00012e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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