Malicious PDF — malware analysis report

Static analysis result for SHA-256 f708cd4b11aa56e2…

MALICIOUS

PDF

78.2 KB Created: 2021-06-26 16:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 75277a97f87edcd88d5c52c7827a600d SHA-1: 3d7e02a6a9a41af2ec805b942bb8088846614bfe SHA-256: f708cd4b11aa56e2d05ac63316b24cf8730942d761032221ad44ca7ccf01225e
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves directing users to potentially malicious content via these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/cb9c2482268d16d5e08f56f13aada1d5/rubopifogegolisisos.pdf In PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aabce95c211---gamalorukezezexusikan.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/nefumemu.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607258510dd4d---xitilaxiwoked.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/ef0d4832e953e3ba65f0df37c50d225e/fusimiroxaxomesasuwaj.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/a47cbd74a1c5d3cc5a10cc50ee9f420a/20243226573.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/cec8c282f46814c91d7f6f80bf4b0a96/lerexemigepuxupiguj.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/032b16ca98301d9de4a31ff3da9cd27f/80670122277.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609840464d964---31391777586.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/c499545cf20d4776c2e2c8561659b9e6/moguzazupudokopobe.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607556f82f653---61171849500.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5d0a95b61---32979919455.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/muvosukesazomu.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/kosemogogisewogonetukima.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/supekatudigubevazawotadut.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/65078266236.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/12447c18ca47684015cb87917f448b5b/94610588212.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091596b0651c---33588023419.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/djgj13cub44g0dbduu0goiudbc/3866782321.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/6ndbl9j8ggjbvaoirasaqn36j9/vabip.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/9e7e54d48dfe26316aef80ffd91fb4d5/nisej.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/25675602313.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/chrvdmrglhqsdijqe0vhj8neq4/85550531294.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=colouring+pages+cinderellaPDF 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_off0000d07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07D 16536 bytes
SHA-256: 40914c69c0adeb633ed1aa072daff420bd65ba94767f7db3ef30cd8d80706d75
font_01_sfnt_off0000fb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1B 10724 bytes
SHA-256: 199e16efa0af1714464c069e52fdea3748e1280872636ac3a5243c7c6ceecd06
font_02_sfnt_off0001139b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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