Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cf31b0ec1d83da4…

MALICIOUS

PDF

89.1 KB Created: 2021-07-19 20:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c290f15bb16292bbb06f11fe2780dd8d SHA-1: 9f8528c0855d545b366e3ea3d04457159bfb8b0a SHA-256: 7cf31b0ec1d83da4f07fa420895d5e4c087513b7db9f2ab502dd9b145fb06204
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads, suggesting it's used to redirect users to potentially malicious sites. While no scripts were directly extracted, the PDF structure and link farm nature are indicative of phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c2ca5639e---21763776575.pdf In PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b378618ce74---29120044823.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/c5qdou4o4j6fo7k5ef9dq079ok/sevaginatoxebagetizufi.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/98084043764.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/68709570636.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/sujidikes.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/26415736045.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160de9e3e6735c---jitafuluwekitadun.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/ganotalumozedojupoludutug.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd2a3238d1---disepimowomapibaduguro.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/metokafawetino.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/vunazava.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/fobiveretefuluziwus.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/430f6978a8c3928d2d8cd3a44cb68c3a/pofewinexowitiwabotetapo.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ab9b838112fd90b0bd423b6079649849/12623353574.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160babc82a0701---53218724479.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/21361244105.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d2542edad---38754255845.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/93392554471.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/rr8rlnj93soqn9u06lvbst699h/foles.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16081813e29957---funavuji.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/15854159650.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56462682fa---82713952550.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/pkg9lkk4a4q62ropn8m4fn8ao6/26687255223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=sixth+great+extinctionPDF 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_off0000f99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99B 10472 bytes
SHA-256: 27fdf77e30405c2ad2625bc832b4551dffbd98ec3ad8691d93e6aa4a10f0c318
font_01_sfnt_off00011165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11165 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12977 17056 bytes
SHA-256: 27c18e69630573c88c943b56a660bf40badb142455ef20ed89d49d7995d3e0ff

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