Malicious PDF — malware analysis report

Static analysis result for SHA-256 e78ec150e22dce2f…

MALICIOUS

PDF

79.9 KB Created: 2021-09-15 10:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 129ffa6d47fd1df5895370a316a57370 SHA-1: 5d01a96fc85091b3223069ae4a97b8fe200a0f49 SHA-256: e78ec150e22dce2fa2b6edab32b5ebdf80edb36abc6a3c4d88d1bde6d47b63d6
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 and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, directing users to various compromised websites and disposable hosting domains, likely to facilitate the download of further malicious content. The presence of numerous unknown URLs suggests a broad attempt to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://saluteebenesseresas.it/userfiles/files/98524328203.pdf In PDF document text
    • https://stockbauer.hu/uploads/file/sawonovojesefakevil.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133623371e3b---8900306156.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/46992014653.pdfIn PDF document text
    • http://asid.rw/userfiles/file/mipuv.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/dikulurogotonuf.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/74458807083.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/73e6fa303fdaf992b878f2cc026de31d/17740836498.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401f2c59af4---89534307012.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/84107065395.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/ravifetunurivijagalefuxep.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/vamanoniganoxokojiremo.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/rutitazabudurupipizer.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404b48189b8---vonuxumunafut.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/11690294149.pdfIn PDF document text
    • http://chokysitohang.com/Uploads/userfiles/files/79113039623.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/todanizaderagezinon.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/84434304778.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/19195007499.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/saguloda.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/94140004074.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=alien+shooter+mod+downloadPDF 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_off0000d6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E3 16896 bytes
SHA-256: b600c06cd5835a042a85e820f830a587c3edd17a03123296732b41ad549f141a
font_01_sfnt_off0001023f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A56 10580 bytes
SHA-256: 90c22df599000d98074b67b3639661ae59e075263c50d848eb793b2bd99ae8a2