Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0bb5409fcbf441…

MALICIOUS

PDF

89.7 KB Created: 2021-07-28 06:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: f3bbcbe6d0b182229cd439f920a3577f SHA-1: 7a430b164d5cc37d429c8be93cbe79c8d11b8c00 SHA-256: 8f0bb5409fcbf441506141c1a5b7f94bb059b558f2b181471eb1e7fbc0a4f8ac
136 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. It uses a ClickFix paste-and-run lure. 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 0.9932

Heuristics 6

  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://mai-colle.jp/userfiles/file/wukusizujetibum.pdf In PDF document text
    • https://estoniapools.com/contents//files/wimekus.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/2a6435c3ef424a0e8391dc17304ef5e7/rimasofuliz.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/xixusilizepamil.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62cafbe9ee---96966165518.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5f4588b999e6eaef5f69be981b27c958/48052590286.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c40b169afe---63699018693.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071defeafa04---83516733306.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/senunazagudijab.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/jozunigogonuretava.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/sigisepakimuwibak.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/knnnpnp9fvfr0u4ab2d69il212/41977684635.pdfIn PDF document text
    • https://hirurgija.me//files/4937346282.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/82437439047.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/479ce40d097ad096acfc9f71db2af3d4/77979473683.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/eaumgiob0c513d9btbcolg7732/luduxidukixopubevazorijum.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/dipodapabosolusogalapaxaw.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/18778095517.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/90002737155.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/vcliiv2o4nosrupjo8cblu8oq2/somepalov.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/natupo.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/zagopemibo.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/81b63ba07f2c58806faecf91996f7cb1/pilopitadalikekidebig.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608963f0b6d6c---4853253724.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/gakoveragujideberedopes.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/zumarixakemon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+do+i+fix+vcruntime140+dll+missingPDF 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_off0000f846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF846 11252 bytes
SHA-256: 230107576b964d9441c8cc14689e1111dedbbe2ed4d4e3b8fd24fb9f4f9354e9
font_01_sfnt_off00011295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11295 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA7 17352 bytes
SHA-256: aa86ecdb3ec0c4d93a0c5c761f56c64795845e191d6611b2c446620712914fa0

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