Malicious PDF — malware analysis report

Static analysis result for SHA-256 961302c2ff9c10cd…

MALICIOUS

PDF

83.5 KB Created: 2021-09-03 04:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8db4710c736767a7a4923f033ed03c45 SHA-1: 19fa9948a345b146496274b1b206a2be1b354d39 SHA-256: 961302c2ff9c10cddf597548f493e85f2abd8b5309e9afa5c56e18ff7f9e6846
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89751469569.pdf In PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5f15cdee0---50238672074.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/kelasimomewadodafusov.pdfIn PDF document text
    • https://akvaguru.hu/user/file/30955840255.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/8339282517.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/xaloz.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8039ee60b---masite.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/84a2070fe0d7be7a232c752b37cdf5aa/40283442052.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/43610276579.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766deeb2a56---berumumo.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/d93801f797568496b3bd8e99babe52a2/pesisowudofulawitem.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d36785affc---zixuligovo.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/l3d65svh6ibu6311k8n2g2qi83/15947971453.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/davulezuzufot.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/co8dbafblt09662bkmdjassk45/vakawobuja.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/b7a775c3a333f1966e0ead0e4b786692/35693652900.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825567f069d---90697186222.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/41396495592.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/cch6hdtlusni2apeggi8s2e7f0/vuzoxexufumanenikug.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/92638152775.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/59441672400.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/kedinizonizigan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=nitro+pdf+editor+64+bit+free+downloadPDF 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_off0000dd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF534 10772 bytes
SHA-256: 8c629da4fad25989742ce0b8f87fe47ca67ba68c757e90094c4b886e012df3e9
font_02_sfnt_off00010dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFE 19468 bytes
SHA-256: 827d87dba2c733992d576209572770d148ea2228facc51738a6b7b53dac4c94c

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