Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f74f7c4adcd0aeb…

MALICIOUS

PDF

86.1 KB Created: 2021-07-01 23:18:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: e53754377967ab723ba8e18b3da60c73 SHA-1: fc395b9b0e2f70c506252b0893edec7ba2f1ed43 SHA-256: 2f74f7c4adcd0aeba71919809716929be3fe2513fb4c20c2fcd370677d13c29e
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The heuristics indicate a link farm designed to redirect users to potentially malicious sites, likely for SEO poisoning or to serve further malware. The embedded JavaScript is likely used to facilitate these redirects or obfuscate the malicious intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2518

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://drafthe.ru/uplcv?utm_term=how+to+say+annoying+in+spanish PDF link annotation
    • https://octvads.site/js/ckfinder/userfiles/files/46255011374.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/5086260840.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa47a470a6---34486909026.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2f289ceb6---56531515552.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/g5l4qvv3tjmc6j5ef6sm69ut50/mesiranumutilalibuwegijug.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/zaruzabisilakekarepise.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/158633887.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/dorikiz.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160711ffee9ac0---posijubipibabukivinadevu.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/jatedimepud.pdfIn PDF document text
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba3df6c5cf---44724325352.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/68476982886.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/52863013211.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3df113103f---35811206211.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/getukuzevives.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d29a8222b---muvetivapavenevozejepo.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/visulol.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc5bbe1589---91430340440.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a60969dad---gazokazenovezizak.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1d52e0ba0---tininorikotokugelimag.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c1a64764c---51419800541.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/bc6887249918871037d8cbbe0c1f1b74/godatiberabon.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5fe7adc08a9804bc60b7eb98dbf12bef/43145590536.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/labilelevipenugukuve.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/setuwunulaxuvojemoli.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/2osn0f2pgjo63hijrsnddrlhh7/70029876906.pdfIn 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_off0000f414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF414 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C26 18476 bytes
SHA-256: f62601f97e63a458c0cf791932352bcd8060c58a39b558dc3cea3e087c777294
font_02_sfnt_off00013b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B88 10444 bytes
SHA-256: cde05d513f8101b579fb38699353421e39c5ef35d02965cca356794aeda73144

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