Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d92434db6265e63…

MALICIOUS

PDF

67.9 KB Created: 2021-09-28 09:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e50acb002105588a15f6c39128217ab7 SHA-1: 56b5684c4399be14b1cc040a8d9463571adc65a1 SHA-256: 0d92434db6265e63c71dcea1bd352270bbf067f8ef78e67602e4b5f3b371409b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://catamma.ru/uplcv?utm_term=intermediate+microeconomics+with+calculus+pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614990f7b7913---25593036845.pdf
    • http://chiari-web.com/ckfinder/optimist/files/tavimodana.pdf
    • http://app0.linkeo.it/ckfinder/userfiles/files/povodobaja.pdf
    • http://hoanggiaphatstone.com/upload/files/xigabebotepojawerapunul.pdf
    • http://abovomedia.hu/_user/file/fagatiwakusot.pdf
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210921_071523.pdf
    • http://faurerom.com/userfiles/file/darudotowavesitoto.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614fcb820faef---zutekomukegebamufedamu.pdf
    • http://www.civilhospitalpalampur.in/img/uploads/files/zimakotikasoke.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/83723688044.pdf
    • http://dubossari.es-pmr.com/constructor/dubossari/ckfinder/userfiles/files/48896783239.pdf
    • https://ssmavidiyar.com/public/content-images/files/sagupematu.pdf
    • http://sochisushi.nl/survey/userfiles/files/84685328354.pdf
    • http://gamax-moto.cz/data/dokumenty/nekojosimolixa.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/1895a6ii24j6c9fav8np0059i1/fowunomagomapuxudujatuke.pdf
    • http://www.awakohchang.com/image/upload/File/0102845282.pdf
    • http://droneducational.com/admin/userfiles/file/83624643456.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/0aa9339bcaa5c90fcc4bdc8e004cec73/mixuziret.pdf
    • https://onlineadda.net/ckfinder/userfiles/files/xelon.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ab11.bin
ea0c18711eddcaf9b408bdb0847049f172c5ad3f35ae6facf184665ed0d5d220		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB11 14940 bytes
font_01_sfnt_off0000d0e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E7 16792 bytes
font_02_sfnt_off0000e8fe.bin
1604d71b667a68914fd6d6ccd30088cf95f4f13910dcf32c20072d04865cce3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FE 11024 bytes

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