Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb59da979bb3e17…

MALICIOUS

PDF

71.3 KB Created: 2021-09-27 17:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3ac1c87166cabda3e9cbf44194a1e917 SHA-1: 608047aca8ed3d60a2ea50984ed75e25198ac9fa SHA-256: 8fb59da979bb3e173de833b033d7cef8da7319dd45ccbf0b7ac5ee5b1a25aa15
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting. These links appear to form a link farm, likely intended to redirect users to malicious content or phishing sites. The ML classifier strongly indicates maliciousness, supporting the assessment of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161438eb1f2631---rezuke.pdf In PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d88e4203cf---38600185995.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/suzeponowemotorudaga.pdfIn PDF document text
    • http://asqcert.net/files/files/kaniduvawib.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/2465774f5ec13b547199076ccf3ebc8c/ziwuxerazawexasat.pdfIn PDF document text
    • http://hainfelderteich.at/60862168291.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/79227376607.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/96722186996.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/54840816825.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/97165686402.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/funeserisirufebatekamixo.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/11265039912.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/dc2e6a3f8149185ef9cfcd5db662d855/rukukosikidabizibuj.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/40907079144.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/9d0fa26b6352dce21b7951842e84d16a/dubenegupogo.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/folerazubowusamo.pdfIn PDF document text
    • http://tjtvina.com/Upload/files/90619475694.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/69177341308.pdfIn PDF document text
    • http://gaudi.tw/upload/file/97409926472.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/lefukojupiloxezujo.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210905182945.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/83072345053.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/fepagifob.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/bitunasubefabufigowu.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/jogufegepisudura.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/51281512433.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=cannot+access+hotmail+accountPDF 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_off0000b308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB308 17168 bytes
SHA-256: 41cc55134c6e6b38d70d6375f984474c981c0f9ce695f0d1f92cd50e20d82f27
font_01_sfnt_off0000df9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B3 10524 bytes
SHA-256: 40ca491df5d3e9c421eee72d75eb4142f921f066aeeb303183ae49f8f3040077

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