Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dde04ade20c8a17…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 13:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6e0f1f76f9a85e53f1049af10c69f6ae SHA-1: 919801f8a1d30797cd8f0cb1a12f28b5e09373cb SHA-256: 9dde04ade20c8a17be9276b4dedd043fcea742b784819f159458b696877080c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://dallapietamarchisio.it/userfiles/files/zuvobonus.pdf In PDF document text
    • http://eros-arena.de/eros/userfiles/file/50472135411.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/tuxarunoromiraju.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/rutoturoxiluzujukowipaf.pdfIn PDF document text
    • http://signauction.net/userfiles/file/kufakexukaravebiwil.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/55720232340.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b36c228edc---wenojisuposazejiseratom.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/lamorabusidagujewevezu.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/xokikupitepa.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/35107056681.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/wefizizudi.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/toliwimimitedumebapip.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613588957a108---xilitogonelip.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/viperibezojuzemesis.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/lewavepubojilonipamabet.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161358162edee9---68488089348.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/2442740198.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/jipivitopoguga.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/80040363765.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/52899838565.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6d9bd98b6---14275157770.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=mtg+arena+apk+downloadPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613237503ac1a---2471220079.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_off0000dd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD78 10476 bytes
SHA-256: 6cd762baf104b235a1d3d3d440ac720dc7b58ce4655117eb8e0620eb3847c191
font_01_sfnt_off0000f541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF541 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D53 17340 bytes
SHA-256: 8dc8b0ec5d787be699cefbb37eae798a80f99bed746a4073717f796dfa4d3b2f