Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15f136d9426c923…

MALICIOUS

PDF

128.9 KB Created: 2021-07-17 03:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c79af64f30d13af9e123436f6f2c567a SHA-1: f0c330b72c2d7f61015ee9ed4f8d642078b35af7 SHA-256: b15f136d9426c92327d20464daa45f27beefb543f90e42595e604eed317e443d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised WordPress sites and link farms. These heuristics, combined with ClamAV detection and ML classification, strongly indicate a malicious intent to redirect users to potentially harmful content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce19a03e131.pdf In PDF document text
    • http://onlineexpert.in/userfiles/file/xorizonolamukojinukumig.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8ed6732d9---mulegemo.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/7db627126463ca1c8f2802ae3ade8011/nalebanatonu.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/datapenuzavodusawok.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/92969663001.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/21796563834.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/31888796870.pdfIn PDF document text
    • http://usmleworkout.com/files/file/mumufasiwibamenoditovenuv.pdfIn PDF document text
    • http://flirdining.com/uploads/files/85369744643.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094bd6272c2b---33968131723.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/a067a334d1229865d38321cbfd4bf044/mafamoduguvodajunufame.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/fapededu.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa0e05ea46---61742372305.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-22/20210522040348927686.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/20ee53f3ba6de645b7d0a5dee3cc3219/gitizujegubileso.pdfIn PDF document text
    • https://matskaren.se/anvandarbilder/203/files/fixaxogerunetij.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/rezajonejapa.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/47824485175.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c697bc0efb---namaloduwolanukizepozuxif.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f44b885d8---zirirexivu.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/jinovinosoninuwiwalobikat.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b8e8bbaea---22605650668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+first+three+colors+you+see+quizPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#Referenced by PDF JavaScript
    • http://purl.org/dc/elements/1.1/Referenced by PDF JavaScript
    • http://ns.adobe.com/pdf/1.3/Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/mm/Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/rights/Referenced by PDF JavaScript
    • 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_off000193a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001abb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABB5 18668 bytes
SHA-256: 7a95a39385faef583852969eb435d75d3db69e15aeb85b7b2e7f740d628cdcba
font_02_sfnt_off0001dda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DDA1 10548 bytes
SHA-256: 8075d976e9238edb86b7ac8d41db2144cace8729c49c2f60796bc41cd8ed2894

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