Malicious PDF — malware analysis report

Static analysis result for SHA-256 633175708fc0bca0…

MALICIOUS

PDF

76.7 KB Created: 2021-09-06 00:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 52773430d689e020c70c3b3d760b07d9 SHA-1: c494bc0bd89980e3dfca13b971751ba34f74806f SHA-256: 633175708fc0bca0e0d9218e83344acc18ef03a5c24ac51fecb28995011af2f3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://moraure.net/js/ckfinder/userfiles/files/totufig.pdf In PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ca27f04e304---kebekepivisasuzobin.pdfIn PDF document text
    • https://actorconseil.com/files/file/funavem.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/5496435608.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/dexebewuf.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/nezixulem.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16093b76f22908---5503088472.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/guxezirumerenipijo.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607695c2cd9c6.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/76610010866.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/683f32d070b930e54744c55a4d5b2c28/51155102791.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/dupevezubekin.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/53673131514.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/e38b614834e43f95f42298a8040ea57e/22509327068.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/fuwaxujugoxabulu.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727c56bf8d8---soxizur.pdfIn PDF document text
    • http://195exim.com/datas/files/38262295549.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/bc4fbee2b6301e6b3823cbc73bf107e2/67996662732.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/3259790739.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/3285005906.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/64007526970.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/jujakerukoxonubuxaxe.pdfIn PDF document text
    • http://safarang.com/basefile/files/novukuvutokozutoderegug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=reaction+rearrangement+and+reagents+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_off0000c52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52B 10960 bytes
SHA-256: 0d405dd92681d16f0e4718a3f1ee2496309277822cac6468986192fcb634ccc6
font_01_sfnt_off0000de60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE60 17720 bytes
SHA-256: 2cdefc2703ac98e899e9ab4edbfdb9ed8e55a5955815eee2a4b215d8360e89aa
font_02_sfnt_off00010cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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