Malicious PDF — malware analysis report

Static analysis result for SHA-256 66574e0f4fbdc133…

MALICIOUS

PDF

73.5 KB Created: 2021-06-30 20:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 362bcf406f8006de2082814c5db471d0 SHA-1: fef5651dd90e6c534c85807f2a737b6e01bc47cd SHA-256: 66574e0f4fbdc1334e941adab60f0dd77050b0768d5174865176dba4f80460df
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by an ML classifier as malicious and contains numerous links, many pointing to compromised WordPress upload directories. The presence of a link farm on disposable hosting suggests an attempt to obscure the ultimate destination of the links, likely for phishing or malware distribution. No scripts were extracted, but the structure indicates a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6229

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 http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e8378f831---13018075649.pdf In PDF document text
    • https://elnativocoffee.com/silver/upload/files/towedokedavirilojifozakek.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d32586304---97706915382.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/72d059d53f29cb06b990c3e43d64fb73/gosiwesusumevemedawi.pdfIn PDF document text
    • http://grabnerestriche.at/80788721089.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/66f5367793a46bfcb9676ac554cd7571/fadinobob.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160766d28a170e---zajixujafuputixasuj.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/n5423o2kttfbe2qo0o630kefja/7760695157.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/66746245108.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d67cc9b8d92---napewu.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/ob8c289qbqq3ft2le5pcss6bo5/visalerevituwozede.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9002ea2445---zemoketikuvetanimazakoku.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c39bdc6ef86---12956167440.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-1/20210501153053906285.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/4cdjikhnl92ieivl4qnslvqrc7/6442676357.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/8f727608d0fa041e492805b95aa29835/4017883656.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/tatinejuxakusalivugupa.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160831a6dc974b---34000087277.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/pisipepaxidik.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/jilozunapaxenatawobivo.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/82h175j5b3nabtdvlv8d909mld/vaxitosugunixoxagotigibas.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/30a165ff8e521849bc5a421100ecd44d/63404555511.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///40843985915.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/20d14c97c30fb6d8d3e7e033b9fba40a/15356293639.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=current+undervalued+stockPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001110a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1