Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1df929d8b084a3b…

MALICIOUS

PDF

85.0 KB Created: 2021-09-06 01:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c52cead7bfb7d5183af9c9d44eff57c3 SHA-1: 09f25f1e2731407589f42a53f7d4a662ea1ecc43 SHA-256: d1df929d8b084a3b764d00587d35cde74dd3283a77e003c8d875efdaddda8b93
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to numerous compromised websites, likely intended to lure users into downloading further malicious content or submitting sensitive information. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://synerhu.ru/uplcv?utm_term=sonoscape+s9+user+manual+pdf PDF link annotation
    • http://tcgardening.com/userfiles/file/2021080611460773499.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/lidugozi.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/d764d66gn5hhb6c1283m2cm166/84851486423.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/avds2e5s7opudufsg30ugd8dpi/mezexopefusaxelopavolemor.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/33426794759.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb60e724f9---fuzupefe.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/kisijubopezivopoxojif.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827cededb58---99580716741.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16079ab007f836---nalafabazevaxo.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/1122007535.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/jizedetevobodarisinajox.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/71698337660.pdfIn PDF document text
    • http://xn--b3ct0dc9bc4a4g.com/userfiles/files/10803347508.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/tojokivixurukiganebifid.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/gekizakifemobexe.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/4141c1904af540dc1eece64098661cb4/tewakigelil.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/zerolenazisodonulivu.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/d793bad7aa38c55895cc0af239d417fe/golejajuzuganas.pdfIn PDF document text
    • http://teresachild.com/upload/files/23357715912.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/2c45fee1f6feee7bfb83ca4fde177d37/nagelifudapo.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/23025099066.pdfIn PDF document text
    • http://rc-modeller.se/images/file///kiwugizi.pdfIn PDF document text
    • 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_off0000e5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D4 18096 bytes
SHA-256: 7392602896fd0ab1059da17fd4abdec0844a619e1edffc368c3a540c20cf00d4
font_01_sfnt_off000114e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E2 10932 bytes
SHA-256: b4712415a77e75d97b9739b6b9fe168622e0686a29f1ea00fdf14eadecbb386c
font_02_sfnt_off00012e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1