Malicious PDF — malware analysis report

Static analysis result for SHA-256 90bc6ec8b1f3d33c…

MALICIOUS

PDF

70.5 KB Created: 2021-09-28 23:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c190c94bce9d6792f3b8829f604abe80 SHA-1: f28f89d7fbbf7f6890044ad961750ca213e5e953 SHA-256: 90bc6ec8b1f3d33c1d42571ed8cdbe354cd13911055151663b9ffbc4a3d8124a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a large number of links, many pointing to compromised WordPress sites and disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://renfrewareahealthvillage.ca/ckfinder/userfiles/files/xuronuwanuto.pdf In PDF document text
    • https://sanipacific.com/attachment/file/mitunebelavizopuxafifa.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/zajupexiguwaxobejo.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/89cc92c0fa9e2a0eafd2c77a335e826b/kituposoziliwugixapakosi.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/80279795082.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/2270513696.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/fbb9f40c042e60f0d40cb976539f7492/67515332839.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/xagom.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/fukureporas.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/98952596085.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d473b330b4---77976795862.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/gisozopipenorivukijox.pdfIn PDF document text
    • https://faceless.me/userfiles/files/boduxeji.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/77217034562.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/judoviditobibatowo.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/70199160048.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/59605116885.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210927191710.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/13018013552.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/labigamupad.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/22832099351.pdfIn PDF document text
    • http://stl-hk.net/userfiles/51265129330.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140322506ab7---46334863964.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/26599909319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=asphalt+9+apk+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_off0000b2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A5 15680 bytes
SHA-256: e15cadd507a745b520d5e26b971a2c6cb42c4a949d44d8c1b70a9d0be82e6f05
font_01_sfnt_off0000da49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA49 10600 bytes
SHA-256: 12700b5f8d2a0beaf43f99d4c0fccd2c42e3cedece2ff9cf3343d8d9c5ad80f3
font_02_sfnt_off0000f277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF277 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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