Malicious PDF — malware analysis report

Static analysis result for SHA-256 40317a08f6ee6578…

MALICIOUS

PDF

64.5 KB Created: 2021-06-23 22:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1656b498cbbdf40ebdc499b92b2903d8 SHA-1: dabff47294b6e40bfb80b16b8b63545b9d5fb862 SHA-256: 40317a08f6ee65782ed8f1717fd781318741681bf52a0f2fc52ed5e3ad8f81f4
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common tactic for distributing malicious content or phishing lures. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, but no direct instructions or executable content were found within the document itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8608

Heuristics 5

  • 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
  • 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://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/202334d5111ea48db7c766d0cced4a37/jawomezejoji.pdf In PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/d3fb8c14d92b5acd7cf1ac2a00edabb6/1396472871.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a15567c22c---tewifutodozi.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/mibinuz.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/46032393767.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/cb74957dc232589e5ecd5f19d2c07e63/69333519100.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087f999efaaf---nobiduwumina.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/tagurewitivifoz.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/lbf53uabj3b2vs6l33opidooeq/71512275478.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ab4d92f67---migizowutufosifurokafexi.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/ffd36e91242ee339b82d1116d32e0c9d/92151615853.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/vekiviposarepadojavuvodez.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdda0a475e---sozobosebujumod.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/830d0665d0f8e56f786cfba06a0190b5/dowigipebilikunux.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/44714479611.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/tirokavazarugojizetuwi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=vocabulary+clothes+pdfPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE462 5448 bytes
SHA-256: ae4d8179ccded18bd8b73d0560b225e5a48e77cba396eb5b1e9369040ee04d11

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