Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb301c41b1fe3ee8…

MALICIOUS

PDF

68.5 KB Created: 2021-09-07 03:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a8da30fc45fdb6af03733b66e32321b4 SHA-1: 8ce3fbbb10fd1895772dc73c0792dac5f091437a SHA-256: bb301c41b1fe3ee8f90daec10ff8e11dd766bac04f133b5e9ee7b41f520a98b6
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload storage locations, indicating an attempt to distribute malicious content or redirect users to phishing sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm attack pattern. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://exclusivelimoservice.com/ckfinder/userfiles/files/kuvuwumezuximubasi.pdf In PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609a87b2964ed---54184842753.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/1705c7b08a23dc615c7f5ddcdff77aac/57072956178.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/3a0126c12f3b6ebc28c465938db7fed0/17368438366.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/7067709934.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/94969980781.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/30138100234.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa226936c1---sawabunolemilulufibiz.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccb92cbaee---kugaxarofujev.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/47115913351.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/53768299586.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/dowozirosubonuripabofa.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/b1d61b4f669fdf522a966088e2623568/govetagopig.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/68264284216.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/rolowa.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e96d9efb9e---jilipumovebutuzoruxijaj.pdfIn PDF document text
    • http://axwelindia.com/uploads/90754494003.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160deb7b9ab55f---90949787418.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/2a6227744e865007baac37784bed2bd0/2138407770.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/tulubuziwizegiwovol.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/574f976580ca8e8b5bc57147a2af16f6/sakasufamukitokefa.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609719a345b8b---tologinabalutovaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=como+usar+cortador+de+legumes+manualPDF 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_off0000b01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB01C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82E 14844 bytes
SHA-256: 4ee57b74d517628f809e4673171873d8a391e9cc1945280892994078191a9d00
font_02_sfnt_off0000ec29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC29 10752 bytes
SHA-256: 146f6e93b3d1aa3c4ca3ba2794769481dcb447cceffaaecb81da68183355479c