Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bb4fd92a47cb389…

MALICIOUS

PDF

78.1 KB Created: 2021-09-07 18:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 145e52eb2e42874a8ce0809f540a2b14 SHA-1: 62f2d8cc47460d3ad406d4fd6ec8697115f7a2fc SHA-256: 0bb4fd92a47cb389d3990cbd5e4412ed710d647a0343237b3c77c1fad7df2365
64 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to manipulate search engine results or redirect users to malicious content. The heuristic firings indicate a pattern of link farming on disposable hosting and the use of compromised CMS upload storage. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2980

Heuristics 4

  • 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
  • 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://allytemp.ru/uplcv?utm_term=turbocharger+overhaul+pdf PDF link annotation
    • https://n-zvuk.ru/upload/file/83136122509.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/3amtm02i81r268005inovi8in4/35252712409.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/33928534699.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/p0l7lbsdplcai8888jvmmq0p2a/boviti.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/81757925683.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/duvikivoganezizimulu.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/99405768239.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867ce87860c---pedaseg.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/43633541176.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/madodagosukikojozodemiji.pdfIn PDF document text
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/nugiwawujur.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/465e294785a00ca9e3d70e27f6bedcf8/17154888898.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/xaxewokoxowovuvajima.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/kamusojev.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/bumimoseniterut.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/856da572542ca0a14f8b047fc443543a/worojax.pdfIn PDF document text
    • http://wdnederland.nl/file/fokobazunuwitubezegipeb.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/1c4d7e264b62c17005e319976edfbf65/99506581524.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/xanenovemesipixow.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac64c52a57b---41068397603.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fdc4f18597---vuvirekik.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d93f28854a---sotodapunisitipesogarokux.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/pewebovakobososisiref.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/73348806922.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/nalanikuxevaledobetimu.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/visunuluzewiguwofizuja.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE968 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001017f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017F 10704 bytes
SHA-256: ee44a6a923bc3bfcb676523be23d876ac188d71bbfab550397e8e0323f4a6e47