Malicious PDF — malware analysis report

Static analysis result for SHA-256 9597f91979acc14d…

MALICIOUS

PDF

79.9 KB Created: 2021-09-21 02:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bc3e860fe799e6a01c5055b396d3a327 SHA-1: b2ada013e1061abef675161d107eda0f741fa7d4 SHA-256: 9597f91979acc14d035551a22b838c033f79d6085c48c2c8b4997ddd7e939755
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or trojan delivery. The embedded JavaScript likely facilitates the redirection or execution of malicious content, while the link farm on compromised sites serves as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://nomylo.ru/uplcv?utm_term=android+8+ball+pool+cheat PDF link annotation
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/71695417216f8f6efd451c04b7fc3bf7/wenagusa.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/jamodabugetilin.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/5955177634.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/jukibalogapudepi.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/34502246944.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/19845437837.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/guxegabasef.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/15886845071.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/57624065946.pdfIn PDF document text
    • https://el-tall.pl/pics/file/gevux.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/95793766829.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/34415759374.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/17240328704.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/bosuwulexudamazijifaside.pdfIn PDF document text
    • http://jonme.net/ckupload/files/33580199954.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/nutaxujaliwojuzo.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/gutavo.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/38778130975.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/repivoxusatekukorejinizij.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/98460438475.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/36578365868.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/b47e7977f4eb13ccf98cc217dce65a42/wasikubaboluxodel.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/lobelisidadi.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/79992706505.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614904cedfaae---32708540718.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/potot.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_off0000d623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD623 10772 bytes
SHA-256: b25b6c3bad1f61494f4488724259f359add42c1fd0b223e5fcd6b3eaa737298e
font_01_sfnt_off0000ee9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 16988 bytes
SHA-256: ecf6434ef7745bc1846008d7041f6293199ca5c84f241b05140d5641c33875bf
font_02_sfnt_off00011a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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