Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b6459b3ccf54b8…

MALICIOUS

PDF

89.0 KB Created: 2021-07-01 20:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 61d54c5836400d58b813bbb0cdc57c20 SHA-1: c7853f3932e1d9aaed7867dec03cc0ef17578f62 SHA-256: 57b6459b3ccf54b88ecbf687de45f350f707c8bbadd433e5f6faae27986b8b4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and link farms pointing to compromised WordPress sites and disposable domains. These links are likely intended to lure users to malicious websites for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=christine+brown+sister+wife PDF link annotation
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/6118f86afbb6aa09ae7817f7469b9b25/pogol.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/pe4lk678astl93gbklg9v61ici/gadawujogudu.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/nezozasumenopanigexe.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/penuvojegisuzozipiwuvujof.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdbfdc2bbb---67404918311.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/95575800791.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/40774662913.pdfIn PDF document text
    • https://topupdana.com/contents//files/vunowadoxaxasim.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820028b0aaf---nokamemotikifuza.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/9ee823b96b093df5770cb9384397622f/moxezasi.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081bd7594bc0---43751583352.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a99f8648534---9343200350.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b391481c---96978924450.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/54600029205.pdfIn PDF document text
    • https://jobtiara.com/files/files/petarewimakazowil.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-23/20210623015807487231.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/gamosibojuvuza.pdfIn PDF document text
    • https://x-software.cz/data/file/dozusuvesinadunirufamev.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/71722929857.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/24825f43aab439411492177cfef3af5e/babugozelunoguweru.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/xisofuvipijibusizijulixet.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7fe3c5b28---gapofukijason.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_off0000fabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D2 10360 bytes
SHA-256: 5be53e8b5ce2d3bd341c1fdfd9834e0dbfc75cdb7fa39c6a4aa8886e89a51692
font_02_sfnt_off00012a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3D 17332 bytes
SHA-256: a8aa7e6439f68b7d1e762f402cd537b65094cfd1e51076b87b327875812401b6

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