Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1d290e5c53dd737…

MALICIOUS

PDF

82.0 KB Created: 2021-09-03 09:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4bd41e1b4847c7cf527f2d861f7305a8 SHA-1: 43af12c62e371aa23fd405e463bdd0e896b36ca4 SHA-256: c1d290e5c53dd73779122ae4d98209f5d3cd7acb4fd75ae2515d6ef33a35a19b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external resources, many hosted on compromised websites, suggesting a link farm or redirection scheme. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the presence of embedded URLs and the heuristic findings point towards a malicious document designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://citronixdeflection.com/nbloom/fckuploads/file/nutufasivojimofi.pdf In PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/e499077c3a9e131e68306764c9af03e3/66435069098.pdfIn PDF document text
    • https://aquatim.ro/uploads/files/79358836865.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/34561810362.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/0pqdo30jfn4kbtlgab9nonnb41/75284141854.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca40d8ee69---kuganajukafazisuresu.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/4ljkrcje5rs23nu6bdliim1mjl/gupokuxobenibivikiloti.pdfIn PDF document text
    • http://www.asslar.de/downloads/36540624543.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b74a36c5476---fufexexasopazifatutakakuj.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/18598224273.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f264fbbd8a4---gitevuvawavixuxoson.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/98516132359.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/p23dvr53m996n90n7r43be315t/84749042569.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/bamagibakeneki.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/479bcd1919ce1286f15b37ad3850dcc8/jasaj.pdfIn PDF document text
    • https://rintrans.com/files/ninat.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b93c7a74c1---74440886880.pdfIn PDF document text
    • https://proia.bg/userfiles/file/gasuxuraxifovisora.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/dedebizidimotepovesuluj.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/tixomugobuv.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/90843d00c99dfd47709e4a4652fa0fa9/73316821844.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/vadukejukifavebupu.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89454d5f8b---xesojedekuresowowudogo.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/f98d689e714fba403d7eaefdcb7f030f/jidosi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=darth+vader+comic+download+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_off0000d9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B3 10868 bytes
SHA-256: e99a2a5018b9efdcbf084ec2ace5cf49e3efe72a5a253a896ba409e512e97f5b
font_01_sfnt_off0000f29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB0 18096 bytes
SHA-256: dc8c50c71e8bd5c5c8d8b6b995c901a3298d2dadd986491316ad7081c0bd04af

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