Malicious PDF — malware analysis report

Static analysis result for SHA-256 8506278a7469ca59…

MALICIOUS

PDF

89.7 KB Created: 2021-09-22 16:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 2710d4e3622268e5cbf6ae36a2e57fa6 SHA-1: fa9c700972a75bad1f9a935f8ee5b0279a763739 SHA-256: 8506278a7469ca5939794f2d523d142da46600faa2736d3ff6ee9a0579a65cb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous external URIs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to these external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://allytemp.ru/uplcv?utm_term=mini+militia+update+hack PDF link annotation
    • http://kimsanghun.com/upload/userfiles/file/20219171734389321.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/suzuz.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/45492221570.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/tidibarurizopazi.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16147108aaba0c---nifuzunimamakarafesuv.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gutatomusawa.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/38060852855.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/selokoderesisiluza.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/ludiwef.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/99892090064.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614012617de0b---gifamaganaz.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/bolabedu.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/mikokosekuvikatizumigi.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/bedetusenolokuma.pdfIn PDF document text
    • http://kaies.cn/upfiles/2109092001232805649ndwi5.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/fofixisasabixupojere.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/78041387383.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/30786217714.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/kififusagoromazekirema.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/gonozime.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/61973402731.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/188c1481c2999421904bbf749a76ca5b/jemamozabinifokalutonamen.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/39122358457.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210908030457_1024701757.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA0 10576 bytes
SHA-256: 30898003ba08ed6e1584e02f67c0fe05ad7358f93e5d9e79ac37865766c028d8
font_01_sfnt_off0000f676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF676 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_02_sfnt_off0000ff00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11712 26144 bytes
SHA-256: 7c39034274af7da8b2f6474da862829d8cd5ce9b53b7026c0845e8ba4ec7d70b

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