Malicious PDF — malware analysis report

Static analysis result for SHA-256 94ee9f6bca207085…

MALICIOUS

PDF

69.7 KB Created: 2021-09-29 09:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0348071aac4ba3bd8f7121a3799a6636 SHA-1: 2a54eb51ea8df2f73189b3966117a326f18f5320 SHA-256: 94ee9f6bca20708581624c2dd7f70fadf40affa38c326487cfbb1b7a38cef6d7
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns pointing to various domains, many of which appear to be compromised or disposable hosting. The primary function seems to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://laborke.ru/uplcv?utm_term=vn+video+editor+maker+vlognow PDF link annotation
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/57353317b81c6ea5fbf5cc0205aa7224/nijaf.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/lezamifegazapifi.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/11166062384.pdfIn PDF document text
    • http://sbairs.com/datas/files/somimokejolunarapelerazil.pdfIn PDF document text
    • https://dcimx.com/files/52630421385.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/95483035160.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/2696594358.pdfIn PDF document text
    • http://rayer.cn/d/files/43997404118.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/wuxugemimejovu.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/98564216210.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/xoton.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/nafezusonomulaperidajuzud.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/84221122245.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/74965387840.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/20992cc911f3f4a6ff9eb5bd2e6a5721/31857958775.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/80502388592.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/lifukurezifebix.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/wowegifok.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/12752245814.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/9e824465d9ac923f3b8ff922cdf6c5e2/barugofuwu.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/23951308628.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/fc8914973014c4e78eb3d0e7148192a7/9968894766.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/nasirojegufasebagaroro.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB205 10636 bytes
SHA-256: 0420050ec815b60e80574b0130fc27c4acf6cdb5cb4191694d8228a1d35d9096
font_01_sfnt_off0000ca28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA28 15272 bytes
SHA-256: 78057192d27a0b342b5c8e0b9f89f7c84cc87183c58e6b0b7f7298d1d32a8953
font_02_sfnt_off0000f111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF111 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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