Malicious PDF — malware analysis report

Static analysis result for SHA-256 238d7dca5f41e046…

MALICIOUS

PDF

81.4 KB Created: 2021-09-02 15:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8b47624c2d94b339a1d75a1bdec1999b SHA-1: 9d8d36a4a76d20636a5579a8f55469fe00606328 SHA-256: 238d7dca5f41e046964aa156c5e25bf699116c33744dd2c81d97a460f01436ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to exploit users through deceptive means, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://mmagame.com/userfiles/file/gerudapa.pdf In PDF document text
    • https://thefertilizerequipment.com/d/files/92542893212.pdfIn PDF document text
    • http://bdsductri.com/upload/files/labakajekiku.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/jowovisuvodevexemamex.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099cfe3a8a6c---20710341312.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d18cc5b35f0---15969709064.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd3c68f5b3---4036895414.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/73728832245.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fdfd4462562---rerefixat.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/fawazinobepitesaliwi.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/xoradarorevaxavamabotoxa.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2254ddbe4---66674288717.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/4198ddd0ea3b2f09014f6b989511f5c0/68266989113.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/lilabomalegaromenenuje.pdfIn PDF document text
    • https://loctra.net/userfiles/file/58263722651.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/18224167095.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/wimativibelusazobewux.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/davomixupowe.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/86031698430.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/tikodok.pdfIn PDF document text
    • http://com123.vn/uploads/file/27923609788.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/81182044089.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0e6325a2c---xixujuvibovidosodedoxofu.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/15338548468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=pdf+document+storage+softwarePDF 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_off0000d74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5F 18720 bytes
SHA-256: 3c127c92264b90b2dcb54372d3d86deaa000d2ec9408bcab29e32d34e066c7db
font_02_sfnt_off00011edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDD 10868 bytes
SHA-256: 1d4de34e9c5f3fea6e2c85d9b317c2954a7898739b4857eb02edb6093549d717

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