Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f1839ab688c3bcc…

MALICIOUS

PDF

123.1 KB Created: 2021-07-18 06:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a97c3b8e7a14868068981f46de04fdfb SHA-1: 0019f1b28e11afab53ae74b3a05afdc76f31194c SHA-256: 0f1839ab688c3bcc08a966af7c8d14fa8bfad71fce31dd5561996593625cec7c
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 WordPress sites, suggesting an attempt to distribute malicious content or redirect users to phishing pages. The ML classifier strongly indicates maliciousness. The presence of numerous links on disposable hosting and compromised CMS uploads reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://csom.cz/wp-content/plugins/super-forms/uploads/php/files/64d1fa63850e72176c272619664a07df/82175068071.pdf In PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021621233647562.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a70081ae6c0---45651214081.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/06aade399c0d116d1db3b3fda72452b7/deter.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/b1616a8a9026e7af9263e417953339bf/xenusesuvawasopa.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607126724bae9---21211214492.pdfIn PDF document text
    • http://limoride.net/gallery/file/75263688981.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/8d1104afce2eb52ccfe9e2f0919a5c46/jifotujudukojizulu.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16073d67594d05---10632522981.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/52382136853.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160e6c34c980ff---zijetapo.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/31127872272.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/r6nmo4j0v3094hui8n5fmv6nqq/19036739188.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/c9s76p2fhcov58dvo4471atfgb/98877408441.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/j7v60alupqjhid5gp7pot8irn1/denuledowozediwetij.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/surevozawas.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/zukefemovaso.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/gifedanogajis.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210624/0932167332.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/bf39fc5e72dc93fe0633542de554bb50/jigakuwulokarowaredu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=cannibalism+and+the+biblePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16470 10464 bytes
SHA-256: 7db9a9972e3d1269589b8f4252dca2a52402f207a473584ce7e2f835f1fb21d9
font_01_sfnt_off00017bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BFE 17792 bytes
SHA-256: f2a1d83a935034203b655fa70e5f6e77b596bb92416085ae4ce1b6977ae317a7
font_02_sfnt_off00019780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19780 18072 bytes
SHA-256: ee52f129979bf5aedd3c10f93549313cd386c41b7e8091337bd2ab1548670b45
font_03_sfnt_off0001c6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C6A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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