Malicious PDF — malware analysis report

Static analysis result for SHA-256 6164ee3cc90cbd62…

MALICIOUS

PDF

81.4 KB Created: 2021-09-15 11:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c2183fc70a0c71cc64002c22b413e95d SHA-1: ef2c395865dd0c9a4f4a759ec3098db6a8dbebfc SHA-256: 6164ee3cc90cbd62b788d333b85ac1019321233375d28a8209e328bb6866c33c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that lead to various websites, some hosted on compromised CMS platforms or disposable domains. The presence of external URIs and link farm heuristics suggests the document is designed to redirect users to potentially harmful content, such as phishing sites or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://smidgel.ru/uplcv?utm_term=how+to+change+your+pokemon+go+location PDF link annotation
    • https://repetitorebi.ge/userfiles/files/misejevazizegeb.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d89c00e6a8---wufavisut.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/retinulo.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/zododugajaxetewe.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70917290644.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613096c672f50---vuganozipunu.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/52779094330.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/82559815544.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/datuxoji.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/torijuworosaxisalopomegip.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/84749147167.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/30848610775.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/xosonesisavupipulal.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/nitabe.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/99036059007.pdfIn PDF document text
    • https://unosms.us/userfiles/file/gilenug.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/19186049830.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/gosubepatorozakuso.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/81957168068.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/40062095298.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/27510179953.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/1d9a9e13d118f3722927999b26284eca/36600753279.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/xenuwuzomolekosed.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/6hfa8sjchl3duhu0em54dbc6p6/wopitezizuwililakaz.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137983c789c1---50192736271.pdfIn PDF document text
    • http://pronobile.de/catalog/file/fidivadojumizuwufetasoxen.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_off0000d8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C1 17620 bytes
SHA-256: 73edac438764ca30882355d7ec8cb6c979c65e3713b930f38187933a3ecd0357
font_01_sfnt_off0001063b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063B 11036 bytes
SHA-256: 3e3849c00f80fff83ca4e714f4769bdc4fff9df43c8733694043b2895f1a88ef
font_02_sfnt_off00011fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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