Malicious PDF — malware analysis report

Static analysis result for SHA-256 7faa426b0b4462bd…

MALICIOUS

PDF

89.1 KB Created: 2021-09-03 19:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: cdc07d3ed66aac935690f0a440fcbc58 SHA-1: bdc513a55e372c9c41181751326f9fdd976b8bc6 SHA-256: 7faa426b0b4462bd70c490f300af92d7578ed6d9af70fa5e119bfcb0a2592af7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious or phishing content. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608df110a7447---38913727670.pdf In PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99707009594.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610884f0256bd---ruverufijogibewupov.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/96592880409.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210521020847_nsxwhx.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d97945b6e1---xikadaxonepigekupuri.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/kesuforoxugumaj.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f93770ff78---wovefetajamifijuge.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/xaxekivoxoposoxugafej.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/rerazisakelaba.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/56906198455.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/dawapenomokoz.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/86chhh9n3960q8uuu8dcm0c1p4/70780807341.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/219569385500cdc813cefc95ae16eb08/siwukofaripu.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f07397925---notavezaxapikut.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e67c6eb794---69040315988.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ab529ac24---55624245473.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/35eb9c2a909878b84c5900f07a5cc60c/13394824144.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zatimuw.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/27729102237.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=republica+mexicana+con+nombres+y+capitales+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_off0000f265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF265 19844 bytes
SHA-256: 6b3177e357d768f897da35ae1b4eaeff2df34f30007535d82bb9e6272b14f8be
font_01_sfnt_off00012465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12465 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7C 11280 bytes
SHA-256: 9c0f63eb0d753c1e6907460f1ae729b3f5879e225ce6e5f10d8cb6ed42d8281e

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