Malicious PDF — malware analysis report

Static analysis result for SHA-256 632c6f677d0a2209…

MALICIOUS

PDF

75.3 KB Created: 2021-09-05 13:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 29434f30912b4d6cd9c2970fcea53a53 SHA-1: bb03f463a73ff937877019aabf1768522f616661 SHA-256: 632c6f677d0a220968e718e4a7ec702a42990686f055dfeb5f92e9dce2ce5e57
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious files disguised as legitimate content. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs and PDF-specific heuristics related to link farms and compromised CMS uploads support this assessment. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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 http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eaf4abb5a8---94767854158.pdf In PDF document text
    • http://aucoindeshalles.fr/menu/file/32028602565.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/f801b3ca1bfe5e3a80e3cb7419926474/fomuzugaxezuzopezugad.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/pedakiriki.pdfIn PDF document text
    • http://citra.cl/userfiles/file/72969141131.pdfIn PDF document text
    • http://schmetterlingsgaerten.de/file/21557861650.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16120c733d6ae2---gonekiwavisagujurovozo.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/16923961648.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160757ba471aa6---relop.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/44b33646a40051b6e51cdc7bdd11c750/judepewisamipusesu.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/pavevapu.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/62942778405.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607011ea412f4---219710335.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/mtsd3crciq78dmhqfaffkapfe3/58188559297.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a18b588e2c---38416534809.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/fawuwakaxenibobije.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/10189963520.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/85238093325.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/85295620270.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/tefivazigasoga.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/44807746032.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607187ce45869---dukabig.pdfIn PDF document text
    • https://susta.vn/userfiles/file/jolezogupobuwulosomodex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=project+management+journal+articles+pdfPDF 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_off0000c2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD7 16576 bytes
SHA-256: 8f350bc041af65f2c8ff5250a9b0d6399ce5cb56808901f4d0c3e1b8c4d260d6
font_02_sfnt_off00010573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10573 11196 bytes
SHA-256: cdc15096baec06484d5a00e0491601ddd3ea25c70368c610cd28dd42faedae87

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