Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ec6bb41cfa38adb…

MALICIOUS

PDF

86.5 KB Created: 2021-09-08 09:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6a5e3a9dd070dc4690f3cfea013a4487 SHA-1: e43a810bce15415b8d04b99fe68aa59b7603ae1c SHA-256: 6ec6bb41cfa38adb8894c3db7520954cd4d7d3e9264743e3f8c6933e67ad62c1
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these redirect chains. The primary attack pattern observed is the use of a link farm to obscure the ultimate destination and potentially evade initial detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://pistant.ru/uplcv?utm_term=foucault+governmentality+pdf PDF link annotation
    • https://eslms.com/userfiles/file/vuluzi.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/80bc4e9ce96359fa259957c82742e97a/71269678074.pdfIn PDF document text
    • http://wohingltd.com/userfiles/68846875838.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/de8b0d19186660d19235f75ac3714a95/38064896034.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/33551317559.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b19560fcee---rediwegonomadewitorek.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/13759225300.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/pitolif.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/xapagitowakudapib.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8f022c44e---66478856878.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/suninixawa.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865499bd4b1---10093735370.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/romagetevapesuzewesosofi.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/89984116224.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/nogizusunopo.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202108280105134038.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85967686726.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/bowig.pdfIn PDF document text
    • https://etimes.mn/uploads/files/wotumelawesofofuwebut.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085265716cac---kowitelevibazap.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/levokewoxerivafojoxak.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/89074198303.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/34840647126.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_off0000eabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABF 18696 bytes
SHA-256: 691ddd96d97b004bf1f885bb5c7b56fbf7250d13adc8530858e19f8522520f21
font_01_sfnt_off00011af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF8 11052 bytes
SHA-256: 36380eba80801daed13fa9216c25d9dbcea01e50ea053fd66cb5ee6bafe75a96
font_02_sfnt_off00013488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13488 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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