Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb333877afd9780…

MALICIOUS

PDF

72.7 KB Created: 2021-09-14 07:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9a8d653fc7a00199b1d01416047709c1 SHA-1: d5a1c4c7d1b784c97adb139c490d542bfa697842 SHA-256: fcb333877afd978076a9aaebd7183e2bc3eaa69a0857a4d18a3d42a50b3fc5f2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a strong focus on directing users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://elskup.pl/images/assets/file/73193306976.pdf In PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54606121554.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/domomawizizalaranodebug.pdfIn PDF document text
    • http://airsoft1.ro/files/file/tuvinizuzibomomota.pdfIn PDF document text
    • http://videlec.be/ressource/file/48755074954.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/28112707954.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109061146573205.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/74625123854.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/livugulaxupidasozi.pdfIn PDF document text
    • https://kvzriu.org/images/file/96219728621.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/roziwetujuna.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/21888432022.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/rozewevokiguvina.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/wifaf.pdfIn PDF document text
    • http://skisun.it/userfiles/files/domoxolaxobanimor.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/fcfe86498b2359f60e1b0d93482b940b/26705151628.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/81276393379.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed71317312---vixodawevur.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/m1onivisf5oqhko4ilb1rgp4kv/75494120082.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff1cc726e1---24402947166.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/161386df90224b---mesumejawo.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/zewevusopu.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/79642419058.pdfIn PDF document text
    • http://millecolori.it/images/file/rozabafev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=after+we+collided+full+movie+1234movies+freePDF 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_off0000ba42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA42 15816 bytes
SHA-256: 0984f490ecec0a2c04a41817265d5a5ddf1a75308ee626c807eec6c000951f06
font_01_sfnt_off0000e2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000faba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABA 11024 bytes
SHA-256: 2ccb4674cb7b497b941d561c7f3882030b83b6779b9f949088300c39699cb5dc

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