Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc022f1a3d6b9bd0…

MALICIOUS

PDF

88.2 KB Created: 2021-09-23 22:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: db45d7ee40a84bfbfa7ab69450da7785 SHA-1: 3d7dda2a500282dae1319d898d1316060135ed2f SHA-256: fc022f1a3d6b9bd0a32c25c4c665d7ef792c5ec7383cd2162e8ef4162c28b93e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites or download further payloads. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://cu-hinothai.com/ckfinder/userfiles/files/32883631359.pdf In PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/wudunexemuzawominosat.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/dosekafezixoze.pdfIn PDF document text
    • http://geraldinekilkelly.ie/44739168708.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/940cfc49858eae2630a0c9faaecf2665/xojetete.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/letigunaguz.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/89995194461.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142854b96a92---7592647065.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/jumafafifafajagubutuk.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/f7cc33324a94309b91c70ebe1b9e4de5/pesaposetumepizaninukokim.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/32525721518.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371213d38a1---lisoxemeg.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/adc8e2cab28b95c867c6f94ae3916d89/61960462198.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/50078998910.pdfIn PDF document text
    • https://cakkue.com/contents/files/25643637311.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/duvakuzegotaxiwuw.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c8e49083b5---retuluzu.pdfIn PDF document text
    • http://newo.ru/files/files/xosiwuzosuxuxelegipog.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/modorepuw.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/giwawodoselora.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/32646919228.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613a021782787---98128799530.pdfIn PDF document text
    • http://secretsocietygroup.com/temp/vinney/HTML/userfiles/file/vinivoz.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16144a5db6c378---bafolu.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/43074211578.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/84045663957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=blade+runner+2049+full+movie+123moviesPDF 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_off0000ed57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED57 19356 bytes
SHA-256: 500e29fe4a0f235e36b2d2c458e59a961b7f65fa39e486c4bb1cbd51b40811b0
font_01_sfnt_off00011fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEF 11348 bytes
SHA-256: d232fc7c1f0c38eb3b5bde8845aa9919f82bbc37abc146291d24ff246e1719c9
font_02_sfnt_off00013abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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