Malicious PDF — malware analysis report

Static analysis result for SHA-256 e04a051e3399b9da…

MALICIOUS

PDF

86.5 KB Created: 2021-09-07 00:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ba8b2ae3bed4419b8dad4e328a68d583 SHA-1: 236bc5b2d8c1cbdeaaf25e9ceb59c971caa0ded2 SHA-256: e04a051e3399b9da05d57604242a71fcc8704d548553dfd0c36e522339cef428
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly suggest this is a phishing or malware distribution attempt. The presence of embedded JavaScript, though not directly executed by the PDF reader, suggests a potential for further exploitation or obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/fhqrplq8ocbhjig4deab0cikr4/gipokegozijeb.pdf In PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/e1f6ee78b5cdaca25417d1bcc1b3c267/3268852555.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/rebim.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/30872796997.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/cef8d19fb94fe77daa4ded563f9d7765/juresifugiligarewu.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/jebuxarisoxew.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/24691791032.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087cc7bd6dce---41956011897.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/xugax.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/kugopixufaremevoz.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16102dd6966c2b---70477589654.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a596169c265---saparipomogewilure.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/ganunujesodiwag.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/63416325262.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/35942633282.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/55746566192.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdf37591a8---96979885259.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/liwipimefigonudet.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/50a5nb9nn97rbanqmi05ovi5b0/fikupiputogekid.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/11416537513.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/nesafirimeme.pdfIn PDF document text
    • https://mollis.rs//files/16346931343.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/87129114623.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e96f517adb---45507205471.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=equal+employment+opportunity+in+the+philippines+pdfPDF link annotation
    • 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_off0000eb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB85 17996 bytes
SHA-256: 3db6b6073a1ee864e23463d4278658c096584ee1d3f8698fce6ac35c6385f8fa
font_01_sfnt_off00011a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13276 11108 bytes
SHA-256: 45d5829530c00b0a3a222694c4c6d8827725aa4b41cedf9741b2e067c5651d9f

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