Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2121a2affd9f9b…

MALICIOUS

PDF

82.2 KB Created: 2021-08-28 11:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1335245a720f84807c0563bb5c835b23 SHA-1: fd9181b4c358b2d58955e058fa7e54f58fe2880b SHA-256: da2121a2affd9f9b571f087f51c26f1c649364d5d3b4566fb171cb52acb500bb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised websites and disposable domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL distribution suggest an attempt to lure users to potentially malicious sites, possibly for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://abwrva.com/uploads/files/12431696775.pdf In PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ad9ea2d6c---vusudixegova.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8f901899d5f1b757abca2748d610970/kekikagavapumazewelab.pdfIn PDF document text
    • https://ikima.fr/uploads/file/27188203068.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7670bda68---10444966713.pdfIn PDF document text
    • http://mc-opony.pl/files/file/2762493630.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/27814090098.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/49879981811.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079798e72d00---lovosoneki.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/89e1c62dcb4df2177836b471f2b02ca3/48287208330.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/73205462711.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/7659174300.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/st3beevgertehekcojlf0e808k/jotedetufasonufugubafumum.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/g95rcb953778av8uujkel2uell/napakigoremobizexasoz.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/35015768808.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/67563133198.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/k1dkr4n8s0itdbc5158qvoj5k6/72351412618.pdfIn PDF document text
    • https://apizf.org/public/file/62342366595.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc597dc425e---kijeduxofunowejini.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1611461fd3ae03---vufopirimatup.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b510f5db2cd---53822386471.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/22862809922.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/vanofat.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/34935880808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=1+200+in+word+formPDF 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_off0000e06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF881 10192 bytes
SHA-256: 7717bf10eaaf84392092f594420cf2199076853e75f85e8edd438b79cbd8e664
font_02_sfnt_off00010f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4C 17236 bytes
SHA-256: b44a0ebaeb2529236b92992abaa6e0a7ff9d330848759dd7e49ed178ac20783a

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