Malicious PDF — malware analysis report

Static analysis result for SHA-256 472b4faeaa4bae5f…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 21:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 42d849ee8d447c2e6b0e459b4f7c86a1 SHA-1: 6b66641b71bf51395fb894fb79d75d30b3427307 SHA-256: 472b4faeaa4bae5f36021d5b7402900bff0618d910bb4304130b5976d3106181
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=bell+hooks+will+to+change+pdf PDF link annotation
    • http://nieruchomosci-swidnica.pl/userfiles/file/wefenorusize.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307c601e224---rodofetu.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/6144882a241f6.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/jejexowabodudufijawuzaz.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/f818qutgt61rubabu7ltd66gl8/mesozitenafufusijobadixe.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141bf23c15a5---jawido.pdfIn PDF document text
    • http://jadeite.ru/images/file/pejubukujiwopobadozetewo.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/nijex.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161429492ab801---koxupafelubotisirumaniron.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140946a5f262---98883680513.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/54737926843.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021090205541520.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/veritagizaxeveguxikison.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/fudegedabolunaguxamowofu.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/dusujesedokinazelojabo.pdfIn PDF document text
    • https://yellowstonewildlife.com/vemitav.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/17628668176.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/52147466721.pdfIn PDF document text
    • http://kite-surf.sk/files/91313700001.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/25933293413.pdfIn PDF document text
    • https://grouptm2.com/contents/files/kalugatagufam.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613d8bfedee95---fupabofinosowalilubakapa.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/defoxilebubagezokofir.pdfIn PDF document text
    • 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_off0000dc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF479 11028 bytes
SHA-256: 2fb8472534275ce627330a2164ef1e7814b0e9a995379e0c0fa07185402689dd
font_02_sfnt_off00010dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFC 18780 bytes
SHA-256: 377b9e33429de863ffdfa6296c483df0699feb3c4e016211e91dedca70be4ee9

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