Malicious PDF — malware analysis report

Static analysis result for SHA-256 208e1de025cebadb…

MALICIOUS

PDF

72.1 KB Created: 2021-09-05 05:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7876e06e864bf7a4f1d5ba72b19e1cf0 SHA-1: 0d7c9bc6da5bfc0b1c388d16278e4f7d5559289d SHA-256: 208e1de025cebadb5a049813affa7b8f7bbdc0f406b9c1310796384f8c436aa2
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites and other domains. These links likely serve as redirects to malicious content or phishing pages. The ML classifier strongly indicates maliciousness, supporting the assessment of a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=free+printable+math+worksheets+for+1st+grade+place+value PDF link annotation
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/94488233965.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7c8a5101---76461414159.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbb653ec22---85791203653.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3dbde6f49e---fexufelixefibogitokulefu.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202151956531567.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/rodededilezuletagem.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ced736d13---xuzarerixi.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/22655729038.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210815052143.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/moranirupusuvemoxesofub.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/tomozudoxe.pdfIn PDF document text
    • http://nppmaudaha.in/ckfinder/userfiles/files/20945367641.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/dewaxapikuwewax.pdfIn PDF document text
    • http://vinmexindia.com/uploads/32784261486.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///65427123515.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/90168074343.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/rogewofudale.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/7b6e964a7a9f4db7ceb30164bb2a9cbb/misiguvoja.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/9jlak3lojg18q2bnksc5odjf5e/bofosegidepalebizer.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/2caf1442713cffb974e431b2bf237c5c/97480186076.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/42822917653.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/c703e6d463fc3467aadb95e9ec5772de/sikin.pdfIn PDF document text
    • 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_off0000b7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B1 11580 bytes
SHA-256: e660bd805dd6d3a31c81b7f9f6bdb8217a3390c7aa81669d62c9c630de9b5594
font_01_sfnt_off0000d2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A7 15524 bytes
SHA-256: e6ae3b93c6d7d4f307d1d8cf9f765945e5637549b9dd29a703f33b44cc38b94e
font_02_sfnt_off0000fa2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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