Malicious PDF — malware analysis report

Static analysis result for SHA-256 4706a5b9bc9eb062…

MALICIOUS

PDF

76.9 KB Created: 2021-09-03 07:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5d0613eca445b2a54f4b7f9940974f11 SHA-1: f2919c9adac7cb2e2fb5ff4e33bbd56fb96b648f SHA-256: 4706a5b9bc9eb06200a0e6e644cc4e41b83a790204c94bd1889eac24edae044c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body was unreadable, but the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://barnesfamilyre-union.com/clients/52050/File/lopusivogudis.pdf In PDF document text
    • http://ahcxdq.com/uploads/file/030942306107.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/tinewapodolites.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3ac903cc0---30848742143.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/nodemuvi.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790a748a334---50753830228.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/kelavitig.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/51726479310.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/1q6hbtfvvocem5kn05vo4hv2q5/56339368911.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/fitapepeke.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/sh4vebvge1ekiipqpf5l220lf7/bimodeseteg.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/7efba832d55a77aa30f7a7bc05a1004d/87594827221.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/45529971819.pdfIn PDF document text
    • https://mollis.rs//files/divulejivadokifezup.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/77639698750.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b36ce122fe2---98441380620.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/c826fe20d4ad75ced80fe5b0c7162ef2/25105812801.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/a8bd1b97f07d33defa7718467da263cb/17793472141.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/a27d5b9e1432a03bb6886b2fe358f6cd/43020435716.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119d2f1284b9---78952581611.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/fokizenakemibetegexal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=salitang+magkatugma+worksheets+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_off0000c8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C8 11296 bytes
SHA-256: 80d9d44a1f54ea8960cdd764aac478aff062e5ed1ae94185c8dff185f2eaef8c
font_02_sfnt_off0000faee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEE 17020 bytes
SHA-256: ad6e39a9b4770d30e058b25f99604950f93380162b0aa1755e6f177d15caf536

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