Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb24f29248c45cbe…

MALICIOUS

PDF

79.3 KB Created: 2021-09-07 02:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 362e7a3253d6dfc0eaeb830805d5f2a8 SHA-1: 5518364e7ee8f7b313c6734fcd779628f448e204 SHA-256: bb24f29248c45cbe2c46ce17e179175e0fa26cf880ef5e5a0eee4df9f931b007
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The presence of link farms on compromised CMS uploads suggests an attempt to obscure the true destination and leverage trusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://pincailight.com/zk/UploadFile/file/2021062818540673499.pdf In PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/wefipokuxutumevuvibe.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/wivujo.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/sofukezi.pdfIn PDF document text
    • http://ausafe.net/images/art/files/81679317853.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/44457269150.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/selijufenibivizalekewop.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086dfd87f655---kikijanakabesebupewerev.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4a142fcf8---75352458238.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/zotakabobawobak.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/xujusuzinitud.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29490987884.pdfIn PDF document text
    • http://homeopathyhk.com/files/fubexutelijejipubalax.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/tjksl1oshs9h72fide24jv2drf/rakiwale.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610464d3a469a---mokajuroketeragakav.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/23462a7239e98026b0a956d437f80b77/59219810433.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/talavodobavotabasuxozi.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/88389676384.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/24581176144.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/lbssurqgmvu782510ermlhs5c6/27388577639.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210823203733169.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/dasoxegefo.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/88845491376.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/64447599815.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/8062711554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=cisf+tradesman+form+2019+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_off0000c722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC722 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF34 20816 bytes
SHA-256: e8d6233f22d058f36fb8347d45720e795487e274ed587bb8972d88869eee8ca9
font_02_sfnt_off000115bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BF 11104 bytes
SHA-256: 67c5077db0e9658a0ca75ba66d3aebebe3e900c75d99d6c046e6352e59849223

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