Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f430ce5a4073ae7…

MALICIOUS

PDF

80.8 KB Created: 2021-09-10 03:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 497ea05409fc44064d8c49fadef98a1d SHA-1: c27083ac2107ee69274b49e271d5fb14741f1d2f SHA-256: 9f430ce5a4073ae75a0ff517ce29614b76cc0943cbcb4459e120faebe042066c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://gongotour.com/FileData/ckfinder/files/20210905_35A76FF8958F4E78.pdf In PDF document text
    • http://galenbio.com/images/upload/file/vodelofupubu.pdfIn PDF document text
    • https://akconta.com/uploads/files/18590906867.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/daviwapilupomila.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/77196441411.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/sotexebotekarafujutobupu.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/a22da73a75c98a6f79adc8823d89446e/85092544954.pdfIn PDF document text
    • http://ranchobg.com/img/file/veseguwuxakonom.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/45731110279.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109022027454134.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/kefevuxazowobenapufe.pdfIn PDF document text
    • http://novafish.it/userfiles/files/niziwekazutunexis.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/3ccbc2a0c3476a639b28f7147cdb7405/xotosuvewux.pdfIn PDF document text
    • http://laserinnsbruck.com/static/93061604008.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/poxavapasanatusama.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/fizegal.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/zumejeseverugupomunafapid.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137e76b3708b---gesoboxuz.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/30307989276.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/fddd383eee9eef31a55570fbb6dfd25c/xesalevisegaxurezo.pdfIn PDF document text
    • http://childprotectionindia.com/lexcyberia/userfiles/files/88650782971.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/kamonisutovelalidas.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/pakikezekara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=new+tamil+full+movie+onlinePDF 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_off0000d9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C7 17272 bytes
SHA-256: 9fa7caca0cc4a9be29d74d258c6da6742e169394ce9aaa175969986b68b5769c
font_01_sfnt_off000105f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F3 10336 bytes
SHA-256: c05bbabc8254306ff783630e92896ed42101264b01810cc9b8b2e3a260d9ccfb
font_02_sfnt_off00011d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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