Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbda658ac83211a4…

MALICIOUS

PDF

84.4 KB Created: 2021-06-16 04:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3cc468864a6f214d2e7ac67e210f5f06 SHA-1: ca795048e41ce917e83997f372b08fe9a2570bb2 SHA-256: cbda658ac83211a463c27b37472d84e377f2ae0a3205b0751b235293bb9e0c37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm designed to distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains references to 'Euro truck simulator 2 1.34 crack download', aligning with a common lure for distributing malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://krisoc.ru/uplcv?utm_term=euro+truck+simulator+2+1.34+crack+download
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/413026497f70a2e96bab77abfd842e70/71296527398.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b829d841d8a---xutizavagazikilebigo.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091fc7c27aaf---xarinal.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/13556a709f8653e5d5e89772dc6a9453/tezevimugefujaxuj.pdf
    • http://allnatureint.com/userfiles/file/92946305931.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/8g2q3rcatgq0nq816qs5ijrvlp/bazelezilode.pdf
    • http://archerelectricsupply.com/userfiles/file/zifidusuzidofadepigut.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/92e105d7a629098ff853a6f9857cefc5/11214485946.pdf
    • http://osc-pribor.ru/products_pictures/file/58728899132.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cc8810399---53510311665.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/fcef014f198f37ff044d6b0ac6257780/nudetuludimo.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/g62vmj2a9tljv1bfbvjnf9aid0/67583823006.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160800ff3af5a3---6282771696.pdf
    • http://bensonlandscape.com/editorData/file/92993665734.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16078aca38947f---zozagepogiragolajari.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/b81cer3rmtgm2gjpuj6u6eikq7/44982736730.pdf
    • http://akcjonariusz.com/UserFiles/file/panip.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d76e11493---bajefunifojukigejosumafa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109de.bin
3d6773ed678d82b5eb75a22d9f7f9761b17f26d6e63874e3e0dbabcdf2bad92b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109DE 5668 bytes
font_01_sfnt_off00011d2f.bin
c89f5ddce0aaf628e2cee0ed1b07bc1b9be31d715d81b293def4a11c8d8b4db2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2F 12140 bytes

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