Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e97a40105c7f45…

MALICIOUS

PDF

86.0 KB Created: 2021-07-08 13:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b48b866eba2ed8a4fbca63e113a997af SHA-1: 9330dfa08ad30db8ec112655df00a4a9a3bf14ec SHA-256: f3e97a40105c7f4554089582e42e4cf06d9877b7af71ec3cba021137d7d2418f
124 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, which in turn host other PDFs. This suggests a phishing or malware distribution campaign where users are lured to click on links that lead to malicious content. The ClamAV detection further confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4593

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cs-golfclub.com/ckupload/files/kapetu.pdf In PDF document text
    • http://bukharageorgia.com/sites/default/files/file/vifepuzekazat.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/97a33e98fae0a3198cda192efcb0422b/vunozexozesojo.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/820e5a6a688bb8cae9b9237857436b7c/57820147766.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/40878647413.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/5be5e1bd45bb3d373fcd67fd15d4041a/zazuziwajezexowonepi.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/4486679206.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/19726727389.pdfIn PDF document text
    • http://mayfamilycircle.com/clients/5/53/53cd9f4101e72b768929e5daf979c2da/File/34306851245.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/gl17c3d9mogivl1ac3ibjspv5m/wabajirojuwexerimokan.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/9de9568cb307d7d20cc5167a8a79e114/xoxifodixapakijigevalami.pdfIn PDF document text
    • http://evola.it/userfiles/files/29110757602.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/20760795263.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/xukedelupilekoranove.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/5a36537fa312df158266975352f01344/pusoriselefetif.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/de53147e9c96f7292b0d8d5ea90ddf57/30112803825.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16097446ab9e5b---88357363328.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6acb4a621---71787592029.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e593476ba93---tefaravuridupifevufowo.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/6383da802d4f84e6e05590a890c57cef/54040548325.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/22q7vla0vkk906u1glvg0sr7d0/xabazupojafef.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/nujivediluvim.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/a72208bf40ed22c6110ae5df50066977/xubowubupu.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef92b75249---77244260034.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/lemidodurofifusojaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+dye+leather+armourPDF link annotation
    • 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_off0001007a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11891 10440 bytes
SHA-256: 561cf8ba3ab0030b3fb75e08f8d480f9ba266ff6fbd79651b3d5db7fd0811dce
font_02_sfnt_off00013049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13049 17588 bytes
SHA-256: 00205421e0e5f7056173b4c1a342fdd1fa54d51b89278aba01857656c066b3fa

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