Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed3b8f4b51b2811b…

MALICIOUS

PDF

84.4 KB Created: 2021-09-16 23:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dc81282045477b9bb5af4a503f8d18d8 SHA-1: 11a13bbd8218df402671be8742006289df1a3a57 SHA-256: ed3b8f4b51b2811b929c12b0c625fa77583665403c769e82396755690a5348e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, some of which point to compromised CMS upload storage and disposable hosting, indicating a link farm for SEO manipulation or malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://volkshilfe-vlbg.at/images/content/files/552828591.pdf In PDF document text
    • http://belniig.by/public/file/41734500354.pdfIn PDF document text
    • http://recrute.fr/files/files/vabaxugilesowa.pdfIn PDF document text
    • https://maymac.info/userfiles/file/jetunogobobulodakotibuno.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/suwolutajuxijalatamek.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/73407890216.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/77991934961.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/99434707836.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/votakuzoz.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327f640de23---nonururevara.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/zanexuxelalo.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f33b1d9a6d---40863335272.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/jirona.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305860bb874---73602987619.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/7522643730.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/joredugerozuwidudub.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/kugifezuxo.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/8082cddd6897752de6e780428542fa5e/vapujen.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b129a38db---jevadidolotedirexovomevir.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/99786937253.pdfIn PDF document text
    • https://sapporopools.com/contents/files/leduxaka.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/zupirejefe.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/xogukibef.pdfIn PDF document text
    • https://fivetc.net/uploads/files/49593759109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+play+gamecube+games+on+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_off0000e35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6C 17876 bytes
SHA-256: dedccebbdbffd31a0a5fb9b053c01ce86da0255341055d17eef114a6f94b95dc
font_02_sfnt_off00012973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12973 11288 bytes
SHA-256: f0be9109cfee082a75214a8bf018fa48546ecd2726449a7281437a1159369d1c

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