Malicious PDF — malware analysis report

Static analysis result for SHA-256 227cfa5d00b113a6…

MALICIOUS

PDF

87.2 KB Created: 2021-06-26 03:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 096eb1cd0d6fdc3618d55dd00a9485f4 SHA-1: b37da403aa2faa6eed4ffb25868deb57e3e417f1 SHA-256: 227cfa5d00b113a6fe87c424fa0b3921805d51e159526625bdb7cc77cce7e823
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://drlanda.hu/user/file/gikozenaruvapexi.pdf
    • http://notarbrazda.cz/userfiles/file/nuxoramujaf.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a2c6a7a20---bajeverobuxiwijakuduva.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c627a27214a---2728168708.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/ih1q5jjupd7urripqf2lt705c2/58655177162.pdf
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/9463391260.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fa4e74049---nomodafalatit.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607b638145d9d---24215407919.pdf
    • http://akcjonariusz.com/UserFiles/file/zivalofobuxomidemewir.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/e0359348f1ceeb0f2fec71c50d9e7b6c/dalinedesi.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/q54si4ou218btmipl24j76sgro/zoluzimenifuwes.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099d8b566f84---vizidaxoto.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/j0ciu47d85fib796jsnrovcfrn/92807774885.pdf
    • https://pasarantogel2.com/contents//files/webubuzabolefaleparuvokov.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606fadae5f292---tapamab.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160cde18635dd1---56065032587.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adf86a53516---zinapomokamavexalilimiw.pdf
    • https://tractorpulling-emmeloord.nl/upload/file/disaxokobe.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/55eq3m4q741shcae0mu02muplc/53918367964.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/001d011fdb81aee1b6aaf9a02de024f8/55381503318.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846321e637e---detodavidovusaxamelodivi.pdf
    • http://sieuthivatlieuhoanthien.com/upload/files/59021533167.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=pdf+to+convert+word+online
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f423.bin
a277959e83527269b0c31daadecf25d35938c29b034bc22a3565fb340f01dd7a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF423 17108 bytes
font_01_sfnt_off000120a9.bin
343234765e47f85f70289536c0881e0bda096c8bc989789b72543d01fe1728cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x120A9 10292 bytes
font_02_sfnt_off000137f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x137F5 16792 bytes