Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc227ced14bc4313…

MALICIOUS

PDF

71.4 KB Created: 2021-10-02 14:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1aed5ac6f2ff98bc62a94f2c2f701d49 SHA-1: 84f05a0b00ed4da351773f11844a85a8e70ba2c8 SHA-256: dc227ced14bc4313b7e034c3c12ec18c799884bed79d70275543172687af9c57
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://zonazero.es/userfiles/file/12403225647.pdf In PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/losisuxo.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/92833905772.pdfIn PDF document text
    • https://alohasafaris.com/files/xivafomevanig.pdfIn PDF document text
    • https://indiansecuritisation.com/ckfinder/userfiles/files/bixizuwebavenugi.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebf46e5398---73402662374.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/tubijexosovitu.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210903_6849D552DB3EF493.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/98410601240.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/3416205209.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/2moaqbkvdbhe7j0dmenkt6s1h8/rajilifizokesijuwowusewas.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/duwodovojosefikemiroboraw.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/pazenalisab.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/41427449717.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ef089129b5---77998568672.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/kegizugurepemigitofukogez.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/87714742688.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/todojodejalusikodo.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1615330b1f3e6e---16172949771.pdfIn PDF document text
    • https://accessnepal.org/userfiles/file/40619779136.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614078c568176---gosafelepevobesavidi.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/mizuwegivojelefuvomibosi.pdfIn PDF document text
    • http://geyuping.com/geyuping/uploadfile/file/2021091321491773499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=smd+components+identification+chart+pdfPDF 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_off0000b28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB28A 10912 bytes
SHA-256: 4e3aec6074f4392162d329f40ec3d6539f8eea20409470eb0138b5250e3217eb
font_01_sfnt_off0000cb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A9 17308 bytes
SHA-256: 3266ba831a53c2876663c146ac7dd355b39e68c7ac55df46b3100e2f9d0c90fa

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