Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24537e6ce409423…

MALICIOUS

PDF

80.6 KB Created: 2021-09-05 07:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 35084f6eeb08e9d855118868b31d2ef4 SHA-1: 574fd57d8872731145a3276f2b741baa09b67ab7 SHA-256: c24537e6ce4094235d92fef5c5b517ecfc81fd7e367bdf41c939bc84727c828f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=panasonic+ns500+manual+pdf PDF link annotation
    • http://lovesenergy.com/file/pixibidu.pdfIn PDF document text
    • http://computerdoki.hu/user/file/sijud.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/xakezafuratovexevewim.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/3f3c3ac8d9601e6f0be7e42273a70a3a/83294673540.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/beditawunaxumopavuwijiko.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16080e3658d7d3---44264803284.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/68552849619.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b6e0ee236---zotoxoluxiviposokuji.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/nafevupuvarapajerakof.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609daeeb1a2a6---41277801651.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd0afde79d---mojapimuf.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/16889000725.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/ruvinifefa.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/16364402683.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9758370042---5472224717.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/7b3828158fce904850be4af914e23eda/88395805042.pdfIn PDF document text
    • http://www.77ice.com/upload/files/temadajukaxafirofiborujud.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/f6b09a5ec0d501582bb7e390f303f481/71631845339.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/52437553867.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160952ce7ea0de---fexusuwulusojoziv.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c52b2366795---tixatuk.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/dekepaw.pdfIn PDF document text
    • http://partnercable.hu/files/71536414748.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_off0000c8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BB 22660 bytes
SHA-256: a44121888bec99a0a7cbfab092e4c45e2213fc50dc2b9f28d61bd348dfec43a2
font_01_sfnt_off000103ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103ED 10808 bytes
SHA-256: ab43459298a86ed820643d506648cd262f7ec672e58c0b78110e968e5e00cfc8
font_02_sfnt_off00011cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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