Malicious PDF — malware analysis report

Static analysis result for SHA-256 182f30d3753a059b…

MALICIOUS

PDF

82.8 KB Created: 2021-09-19 19:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c75341f6269525dcf68b7b27845237fd SHA-1: e3d5b19bbf1ae1d075bb4135619b7b72ef8e01c4 SHA-256: 182f30d3753a059bf049f3a4679df3f170e5a0c7363dd503d9b1e0472bf01dee
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories and disposable domains, indicating a link farm or SEO spamming operation. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. The document's purpose appears to be directing users to external sites, potentially for malicious redirection or to boost search engine rankings for specific terms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://jbdclothiers.net/emailer/userfiles/file/dodaxi.pdf In PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133be4aa0f48---samemepew.pdfIn PDF document text
    • https://funke.be/data/file/25691700495.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/39278791312.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/rajivunizilotexevot.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/pilirevobofumiwiraf.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/980df274c95fcd5664e77ed80b8c947c/kunizikoxunurabami.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/jozoperoxaxur.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/21065048229.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/66242718037.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/kagajat.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418a028fe3a---pijiro.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/79479535277.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/2201729047.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/33346580037.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/68801818968.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/68860552704.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137c749ae887---xuwis.pdfIn PDF document text
    • http://stefani.cz/fck/file/911933979.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/zinajizovokaxirok.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/dulinomoli.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357d8e86dc3---14888991850.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614553d72e579---ditigawutaxenazofavomun.pdfIn PDF document text
    • http://sns.hu/_user/file/bababagoropefosate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=descargar+temas+de+futbol+para+androidPDF 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_off0000daaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAF 18616 bytes
SHA-256: f94178f15f9144dec4b2339c7b0ede6d6c76917fc408b089e225c79738ff5509
font_01_sfnt_off00010a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001227d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227D 11204 bytes
SHA-256: fbbe76504edee1425c0a2d3a072bfe3a8b85e6699d72e89922ed25277793f2ad

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