Malicious PDF — malware analysis report

Static analysis result for SHA-256 92422757769a159c…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 18:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8e4498a1c134927bfa1ba4d1d4812ab4 SHA-1: 3f83a028be9c4863bcc7119e5871962f71989e2a SHA-256: 92422757769a159c938e18fa6f6939333f3cee8baf23da8c8e8924c5bebc402f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous websites, some hosted on compromised CMS platforms. The embedded URLs suggest an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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 http://eminenceinc.com/userfiles/file/rimabatisuvimakife.pdf In PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/18136991335.pdfIn PDF document text
    • http://hengfengpaper.com/filespath/files/20210920012549.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/8abafb461b1060a1867b69f58858145a/joradarugat.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16134aa3640c6f---gotegozujatutijabevotum.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/fijatizesobakofiki.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/67659738975.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/f916b267051f16d5d4a0feec95c7329c/42164932752.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/pk5iuhpe7e2j5v1u6qotde0ihr/65835885555.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109171111046734.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/zevelatosarofij.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/sajudivabidogavoso.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/15d4c5a9f689909467db363789bdac19/lupiretede.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/42083043574.pdfIn PDF document text
    • http://strandedtattoo.com/file/pajabesubodetisa.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/519172980613d2942de99d.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/25956865603.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613002f6e298a---88278048915.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/misafapedoxawudibog.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/99802369275.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/851c65f1ed2d01e4ad1884af6351514d/goruvubiwo.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/bijapuvafo.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/ligapod.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/45521157225.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd9df53b3c---4359607525.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d032ecb05f---vuxijafonejogukijasame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=where+does+android+install+appsPDF 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_off0000d844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD844 10480 bytes
SHA-256: 797d2b2de77aab34bebf18d2636d95f437f39f799757086a57ea041b46834e69
font_01_sfnt_off0000f005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF005 17084 bytes
SHA-256: f20dd4965a72176261b1a0ce36b75a7c64927a0714bb4952239ac342c777f277
font_02_sfnt_off00011c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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