Malicious PDF — malware analysis report

Static analysis result for SHA-256 7633d1d6a8dcc8d4…

MALICIOUS

PDF

81.3 KB Created: 2021-06-19 11:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9eb89777ee4c95837797447b6d9ec0c8 SHA-1: 57fadcb99b7536afa27eddfea56d9afce470ab26 SHA-256: 7633d1d6a8dcc8d48af5367c2428157b89a0104ac6e3e9c60f785070edb40ee7
96 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm or phishing attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment. The document body's reference to 'Fallout 76 lode baring rewards' is likely a lure to attract victims to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/5er1e8nvln8mpbe24eq75rb5km/kejavuvolike.pdf In PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/g0s60e3ss4538smg4pae2ivkb7/gelejediwifovanawizaxi.pdfIn PDF document text
    • http://learningkey.org/userfiles/laxerikovum.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/mexirebusidalupejexidalu.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/b9a1d55bfabc5bad75f2b318adddba79/93111146280.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/4heg715vad99204uevu92f1s2l/nekimurokegikusok.pdfIn PDF document text
    • https://0900107678.com/upload/file/99061940364.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160789c0626fe3---43610010354.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/r9prgf8k562r6fh2qu7dfu8k47/wegapifepobabumu.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16097693775a47---13558178379.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc757d6e891---36971053254.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608513ca5b6bb---fudefuwipukubukokotas.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca9e36b155---55963429231.pdfIn PDF document text
    • http://panteres.com/files/files/migokilogadizag.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/38871130017.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d32fab3d19---biwaziboletubalajavava.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=fallout+76+lode+baring+rewardsPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAD 5416 bytes
SHA-256: fc0c02ba59fa1b6c11abc650dff199d3663520559d133f6daad740128cc40130
font_01_sfnt_off0001123d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123D 11188 bytes
SHA-256: 7828b2701e39ad57ad3de29315f6af397562f349cda3873d29d52a9d41c26f31