Malicious PDF — malware analysis report

Static analysis result for SHA-256 7879d94e01fb1c54…

MALICIOUS

PDF

79.6 KB Created: 2021-09-18 06:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2a6bc53a37c8523ea2cb3ac70e913f7a SHA-1: dc3238c21c956451f8a803870d86203e9872e998 SHA-256: 7879d94e01fb1c54c2561704bd4bbfe3007318ae9e3f7b6cae32fb8ee42a3d94
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or redirecting users. The presence of numerous external URIs, many pointing to disposable hosting or compromised CMS uploads, indicates a link farm designed to obscure the ultimate destination. ClamAV and ML classifiers strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://frangarcia.eu/upload/file/nojakum.pdf In PDF document text
    • http://ameshamagazine.com/js/upload/files/jefuwokisofuvobanat.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/55182094537.pdfIn PDF document text
    • https://labelmarket.eu/data/file/jeliliwarudipoja.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109041023489820.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/64317066872.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135020e3e0f7---62597918552.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210907_142201.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/02a263e4ac84d6bb6a5e4bee5958a6ce/tekikitobaseximokiduw.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/83059749463.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/82121953867.pdfIn PDF document text
    • https://5udua.com/contents/files/wogizugilatoxar.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/12956591273.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/pisogoraduvinaj.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/koririlefijig.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/nefitoduwimavuvaneg.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210905160046.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/wolufumobunefizoxevavami.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/feveluzoworozevifo.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/lazoravupu.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/wuwamimoteni.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/2e0fee065e6b31f2bd85d77c4ae41a9d/66784083300.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/saperategelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+connect+android+to+laptop+screenPDF 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_off0000d227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD227 17836 bytes
SHA-256: 7c09540db3cc73051a4552ae761308994c85375931e551f28e5cc2d4d7082b21
font_01_sfnt_off000100b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C8 10584 bytes
SHA-256: b41e3cb588c2c2b86073161fc37ef8d3e358280982e04f9821a365803dfb7073

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