Malicious PDF — malware analysis report

Static analysis result for SHA-256 5417e4baccd0114f…

MALICIOUS

PDF

83.6 KB Created: 2021-06-30 18:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: c21369bdc7ff9f33755cb455883b3c8d SHA-1: e4980b3c8222a4033d87d110b33d21576438cb7b SHA-256: 5417e4baccd0114fbe8e33b638790837efa580fe4df043c17aa64dfe3b4d2356
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm that directs users to multiple distinct hosts, many of which are compromised CMS uploads or hosted on disposable domains. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to lure users to external sites, likely for further exploitation or phishing. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 5

  • 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://paykaaluminiya.ru/ckfinder/userfiles/files/88600909333.pdf In PDF document text
    • http://duszek-lasu.pl/userfiles/file/23507718281.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/o4f2atqmgronmam52iak9p6efv/36430401031.pdfIn PDF document text
    • http://dnepropress.net/files/file/zonilojalava.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/l3u4ptil0dbmdekv9oecijutqs/menozuz.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b79bc88471---32456371016.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/9e5600cb0cef72fb28dade6d10b7291f/12015556700.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b5397f6e2---94247248960.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/7db497e3b4e39f872c31105d2631f278/92176133440.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160757e06d9cd0---14646666936.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d40413a711f---77228069644.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16077e77cd47bd---16112174609.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/caof434hov58n1meab8am6b3f5/mejuraruweti.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/b5ada3179af4b71428ee7d3a4581339d/fitavataripifi.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bb142e031---lotokupeto.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/83497834098.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/jovidokidatepugezoja.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/fuzulemikowibixupolofilen.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b36f6d201---6782645585.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8965dee17---29626791508.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/dq6rblv4itclnrpqb6hetmgru3/xatipokarolifujo.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160757a7d2542f---sowabasepukulexedikezime.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/95576172005.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/4771381558eab8fb671a680c8704769b/meforag.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/a2915b8196a715bb6ad47a0a4715eb49/21970974790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=meaning+of+tramp+of+hoofsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E8 16924 bytes
SHA-256: 7269e92ed12c0f179452ecb13da845c59286607b532ee4e05f9f227f973ed6b1
font_02_sfnt_off00010ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF5 10752 bytes
SHA-256: 518bffa650bb78a46cc4389a125028fac2e9c5c7f4337d7b87d1f815c460b7bd
font_03_sfnt_off0001277a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277A 16612 bytes
SHA-256: 0824fa45ef973634dd8ecd92c94bff9d2d45bc0d05b1ae7a945e7a3f7a788307

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