Malicious PDF — malware analysis report

Static analysis result for SHA-256 160937f3a090d41e…

MALICIOUS

PDF

84.5 KB Created: 2021-07-02 16:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 08aa3f7f096809a502e59b0fd7dfb7dc SHA-1: 38680a28ac911352d87a711ed26d412d22317f64 SHA-256: 160937f3a090d41ee5cd52c0ac3a292911ac9cd256d9bebc14c5177174af64f0
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised WordPress upload directories, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The ML classifier strongly indicated maliciousness, and the structure aligns with a common tactic of using compromised sites for hosting or redirecting to further stages of an attack. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://mytopics.it/uploads/file/tutarojumo.pdf In PDF document text
    • https://equantumconsulting.com/files/files/pikanajaf.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/1455006a65e97e3934c66fd51a43d5e1/lewubakokemewep.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b217d775fc---kopisexesawizirapug.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/77840cc111140c76b41fa26944cf5ca2/tukigopumezemupefopixe.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/7c0b31815e326fe5d111fbe4e2ae7fd2/rujekajogixir.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/nesarovifetamubesazenigun.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccf252f1ec---15280525540.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160942114816f1---49706600470.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/77012246104.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/0e07fcd8d5a50218be5f20496ec2a968/73508280718.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/5a486d482dbc3b8d7086f575b24a7152/60204231968.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/0a9dc3ac7f1d4d775b0d4075a2c88d9f/50543588267.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/laxakusararanitufolapuxan.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/022119054556.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/r4nl9f36sqg3m3cc7c3ak2dl35/sagitodalagimodazivigip.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160844ab787dba---dekeke.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/a1ahopo4nhebuaofvu7ihnmg1d/70553796455.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/c4884f78fc5ebade57412a1a85c49f76/75218459190.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/41460226456.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/76532303166.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/31b0c99b707fd71a8e343a689d53d309/37330892452.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/e4dc5779fa26f38b8c59390b2165f0be/zetukewuxupod.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/bixupebabal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=meaning+of+cliqueyPDF 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_off0000e73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73A 10496 bytes
SHA-256: fce9393805a8029ef6950b5afb16ab55d05aaeb7d964c54a4a9c8f736e2f0f96
font_01_sfnt_off0000feeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FD 17172 bytes
SHA-256: 15121fceaa9c1ab53fa79fb1629d9830cdef4214626d924bc94fdf4a36a447c5