Malicious PDF — malware analysis report

Static analysis result for SHA-256 964a04e34c17fa6a…

MALICIOUS

PDF

80.1 KB Created: 2021-09-10 11:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d87bc00740436e86b5c3a8dbeed1fa87 SHA-1: 0861338fdb5bdd206d3fd86c1d75468d3add31f2 SHA-256: 964a04e34c17fa6a72cf53df9a9bb4af3c2da7fd3e65eae3cba8d9d60883fe79
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm or phishing lure. The presence of these links suggests the document's primary purpose is to redirect users to external malicious sites.

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://capitolmetrophysicaltherapy.com/userfiles/file/97779777678.pdf In PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/1r68745ghblsf184pga7b64cgg/xegurijeko.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613b10b47b4b5---89696731017.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/15252980769.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/gigerozo.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/puduxudikenedazorofivepo.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/dc38c0b42b546ffb25c52cf59a5ce39f/60214815053.pdfIn PDF document text
    • https://susta.vn/userfiles/file/meripisabapivopubigepirux.pdfIn PDF document text
    • http://opsir.eu/files/file/9592748672.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/famedevifixozupesowuwa.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/vamaxepib.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/30549905847.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/895j2a3jtduf55jnft39c0gab5/webodevuzavepetujifalibog.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/nixozipomefudad.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/39119375033.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/leriwuwi.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/92823786794.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/lirur.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341aa786cec---95236666237.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/3866a2c1d9a47614954c375e97f79e06/mujiwomi.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/37721094898.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161362f6f568fa---89651210627.pdfIn PDF document text
    • https://atlantidegattico.it/file/62340658881.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/sipibiluvi.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/bufomikuzubaduzuzopoguv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=samsung+tablet+failed+to+obtain+ip+addressPDF 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_off0000d40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40F 17296 bytes
SHA-256: 9ac588cbb7848067c2d6948ccc3c7fb47f0735598bbfd9d6642108f839d93050
font_01_sfnt_off000100cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E2 11156 bytes
SHA-256: ec59efbcae4bca68ed89f77c81a267195e6090dc1c11337c9b5d63470ed11681

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