Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2d8213a0f41d593…

MALICIOUS

PDF

74.3 KB Created: 2021-08-05 09:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: 8e565226ed86af74b3cabab170b2cc27 SHA-1: e998c08ef7a91fb2f05344a4377e0159a8ddfc41 SHA-256: d2d8213a0f41d5939c7f15a46bf8b816817f74b2a7b3e43d4605ee91eedb5895
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://coretry.ru/uplcv?utm_term=pokemon+ultra+sun+and+moon+emulator+pc PDF link annotation
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/e168b22e507bb87347a438366d16feef/86771909453.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/naboxosudefet.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/195da441ae8378011c91297fa553da51/zalenodujelejagaw.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/u26hsb2h7bqbfh8iot33ijlak0/pitanubefegedi.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/sanegogobolegema.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name//files/99374117083.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/fukejukisazalabivupel.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076575eaec52---damujas.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607594d6dc203---99300687014.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/ri8dpqbatchg134kb490787vg5/furozimesoze.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14cff7d3b0---42030535951.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/f9a09751c9bad3791fdd15c1f17aa8dd/48872920821.pdfIn PDF document text
    • https://asiabiru.com/contents//files/wavivisodo.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa03287afe9---ginadosunuxelafubosisem.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/b576badb1904e69453b80add3ed332de/79347272871.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076b195e7305---resuvofaladumilizugokuwe.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16092f05857ce5---jujabilugepibiwezixopadoz.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/894d07b65821ab321a664add9be2a1bc/sexiv.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/17137467963.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/pagatikumowoperekepij.pdfIn PDF document text
    • http://noahsmarinesurveyors.ca/userfiles/file/renepuxevekurenasekuberes.pdfIn PDF document text
    • https://alutat.com/data/file/jevunerigoza.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ce5924a8c---tuguporemuxefegawabibube.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_off0000be77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE77 10776 bytes
SHA-256: 35a1d5ad18c4e1bc6dbf496b51ec6680bde9c5ba539cd8a19a037501fb1efb0e
font_01_sfnt_off0000d751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD751 16300 bytes
SHA-256: f0e6b7433ca61d9b8625b6b8443dfbbf22ed4b1ca7a6034dfbd7a7cbd39659ca
font_02_sfnt_off00010185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10185 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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