Malicious PDF — malware analysis report

Static analysis result for SHA-256 24ee8d516355d94f…

MALICIOUS

PDF

81.0 KB Created: 2021-09-03 00:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9fbc7ff40d752c911d4c3cdce72fbb8a SHA-1: adec7f0f695835dde7079882aa4751bfb2451178 SHA-256: 24ee8d516355d94f8520560e8f0326b0d1ef2ae0e480ceb85a691ee564b4b7ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, likely to obscure the true malicious destination. No scripts were extracted, but the presence of multiple compromised URLs strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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
  • 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 http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16072fe86b3744---11429146391.pdf In PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/80a91e1d016e4ed27ca17652b2107ad1/jimelazujurefexujodurom.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/7949b8e5acae6e190f86eb39ed442d7b/kabefidasawi.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/66068493664.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b31ef0a37---20348787732.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/92486837779.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/9038776001.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c38682bf3a9---83284101721.pdfIn PDF document text
    • http://podarox.ru/public/files/73093824259.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/a2096abf9ed9c988043b7119fbfdaaa1/gabunotuwidex.pdfIn PDF document text
    • http://falerisztika.hu/tmp/vevone.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/nak9co1p3fsv0vljg07fq4o1s4/luwonelunixizose.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610c01c5e2984---30206754796.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160704ac764f3d---66145121764.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/5erne7ei37srvolrl0b1fnf603/potilo.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/40098639368.pdfIn PDF document text
    • http://abington1964.com/clients/865474/File/bepaxojuzukafojakiroxi.pdfIn PDF document text
    • http://sushi-belovo.ru/files/20911994360.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/xubejusiwalimurorabe.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/valulujamuvodeziribifuk.pdfIn PDF document text
    • https://amblamy.ee/upload/file/29199697967.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089394c54d8c---71827495721.pdfIn PDF document text
    • http://nfc.soo.jp/file/35270355750.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210616_092012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=oracle+reports+6i+output+to+pdfPDF 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_off0000d942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD942 17184 bytes
SHA-256: aa817c002074a171fdfb2ef9602621aa535586a10619d1152ca1145ac9340725
font_01_sfnt_off00010580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10580 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D97 10800 bytes
SHA-256: 95343db0d73535fc015391c45f8b88c3fd58bcebf0fcc20cfd4b6d2abf12de98

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