Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4211b976e08008…

MALICIOUS

PDF

80.2 KB Created: 2021-09-02 15:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9fc7cce7c53ebe518355118cacb6dcb5 SHA-1: db50788b13f2fddc9d6fea89c65487f0f5c25769 SHA-256: de4211b976e080089b52d8d3117ec5322ff164d158c77a6e980d76ffb680ecb5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised websites and potentially malicious content, as indicated by ClamAV detection and ML classification. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to create a network of links for SEO manipulation or to host malicious files. The presence of a 'Download Now' lure further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://autosoftware.company/autoresponders_images/files/42988820207.pdf
    • https://najarshi.com/basefile/najarshicom/files/zapun.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/o3hiknen29ct0jds0pu0k1hbsq/95107117054.pdf
    • http://ondrejkocar.cz/img/file/nuzoxosozolodupewerotos.pdf
    • http://ixtvs.de/_upload_bilder/_filemanager/file/33401285555.pdf
    • http://shopexpert.com/app/webroot/files/userfiles/files/377793307.pdf
    • https://murtenhof.ch/userfiles/files/mumikujewe.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/6c1b7112b661a08518f7052cc2310f27/vexoxomuzolipajanefixolep.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/161012ab409f4a---12497094065.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c02d6a0b4e---wesow.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/v4v8bhffqfias6be4qq2u1nce3/poxojovosixikujeri.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0d913ebe---42621621862.pdf
    • http://domusanna.it/userfiles/files/18115342231.pdf
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/47381331226.pdf
    • http://sjanzee.nl/file/zijewopexab.pdf
    • http://asustainable.com/global/file/pevaxizuvobefi.pdf
    • https://footballsod.com/images/ck-uploads/files/58175731655.pdf
    • http://mydreamtuscanwedding.com/editor_up/duden.pdf
    • http://mini-garden.ru/userfiles/file/rijerojuxadetuwa.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6538aed93---wuwuxodun.pdf
    • http://domainecomps.com/documents/files/54548260217.pdf
    • https://bawwabatrizq.com/userfiles/file/86221315986.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-11/20210511164931179307.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b85b611484---vokudiwepekofizobi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=objective+cae+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d273.bin
6dcb44da4c5930d1e9c8cdb3a79314a82904431386c513dcd717213c6888245b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD273 18840 bytes
font_01_sfnt_off000103ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103EC 16792 bytes
font_02_sfnt_off00011c03.bin
be8255714e034ceac80a092cf994e20b7234e10b57b80144f5682047bb1e9d1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C03 10436 bytes