Malicious PDF — malware analysis report

Static analysis result for SHA-256 3caacee2140f9677…

MALICIOUS

PDF

83.2 KB Created: 2021-08-15 17:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f327befb95b0ad8b67152993ff5e7bd6 SHA-1: d5e7e72a46a78d88cdc8dbc6beb442c8213f9390 SHA-256: 3caacee2140f96776c2ca80621d388ece8028c92553d18290dd8afa58a500c34
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting. The ML classifier strongly indicates maliciousness, and the structure suggests a link farm designed to obscure the true destination of the links. No scripts were extracted, but the primary attack pattern is the redirection to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://beytarimcilik.com/admin/editor_resim/file/9850738738.pdf In PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/5557c28ca7dfc886fd6c6d7a6581c90d/rajijuto.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/4l8na2psslqmc94mkp4cd38o3t/35504504623.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/jevogosupaniwolelizudu.pdfIn PDF document text
    • http://fluidearthconcrete.com/userfiles/file/88453313731.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210730011627.pdfIn PDF document text
    • https://capecoralliving.com/media/file/96695264866.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816d58cf70e---60641226473.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/17283688388.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/9fef155b1d35b51826bab9a580b08ef4/korukozovapidux.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/75526341147.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/84688375402.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d95007888e---29680597526.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/pipirajarukenotateluna.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a61508fea9---lamopa.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/07ff51ec2e0850c3dab93ce0c46a9b93/90508107153.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/33298376572.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/74787305147.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/zudetoz.pdfIn PDF document text
    • http://xycrusher.com/d/files/lofofabevamekuvozite.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/817d74a73af0ba0ea41ad5a87f2fd920/28996364542.pdfIn PDF document text
    • https://flyfinz.com/userfiles/files/doresunalorof.pdfIn PDF document text
    • http://air-ned.com/uploads/files/72298809443.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/9586697973.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/66483402801.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=corte+bob+pelo+rizado+largoPDF 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_off0000e187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE187 17456 bytes
SHA-256: 96b698e1485709d13a45955c99983c611b7fee93439a671e46a8facf10647d2b
font_01_sfnt_off00010d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001253f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253F 10524 bytes
SHA-256: a610f11177584a47e31985bdda06918adfd4694cdec5f8eed34b7c059fe8dd0f