Malicious PDF — malware analysis report

Static analysis result for SHA-256 3462204956ae1bbf…

MALICIOUS

PDF

77.9 KB Created: 2021-09-01 10:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f8218f6d8058def2aeb024d15cb23d2e SHA-1: 875927a84cbf944a6bc0ce576c886f19225c2ca5 SHA-256: 3462204956ae1bbf7cc23b41876ffcb7f3c6673ad507c6906aa7feef51c19d95
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the structure suggests it's designed to host or redirect to other malicious files. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 5

  • 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://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c29363608b9---80067684127.pdf In PDF document text
    • https://ski-experience-japan.com/images/blog//file/23105364868.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3f86b2dc8---mojuk.pdfIn PDF document text
    • https://corghialberti.it/file/17661982793.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/13697445613.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/duzanuxodesu.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc9e80a74b---24654073157.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/24367115035.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/16431919497.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0e371d8a5---zoginesoke.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/lumuzada.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/38f65aae89ddfbc01c60fdbf257c15b8/zuromiraxevutaj.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9554b1333---76333960124.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161299092585f7---guvire.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/70423588047.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/55461621955.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210813094727.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612a72aa8b301---visiza.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/a4fb4b468584c483ebc8a844dde87225/74187548271.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e795f80c86---futiverixuwodo.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/17bn87n81jra6kh0qkbccdm7v3/jiluvijozijeno.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/86569827841.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/83187879244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=base+and+height+of+a+trianglePDF 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_off0000cb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A6 17512 bytes
SHA-256: f50100961f57f122798a8023fa957c8591d94d200bd799f7d87de0840b3eaf34
font_02_sfnt_off0001109b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109B 10688 bytes
SHA-256: 37fbd445943fd25aafef4a5b96db34795a85bb1ee198c51a84d94a331af47ba9

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