Malicious PDF — malware analysis report

Static analysis result for SHA-256 15b07c24b023411f…

MALICIOUS

PDF

68.4 KB Created: 2021-05-27 17:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ebcec559973231d12e63fb32c67f8899 SHA-1: 4820ab12acb43a544250d4b895975dbb1b2ac494 SHA-256: 15b07c24b023411fa42f9920568598a132df9f5ce4f988cc733dcc434c1693e2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious files. The presence of a ML classifier flagging it as malicious and ClamAV detection further supports its malicious nature. The document's structure and embedded URLs indicate a phishing or malware distribution attempt, likely using a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8938

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1m0hgva3q8c6r1as48r1qj9tn1/kotumuzetirezuluzeza.pdf In PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609458d71b7a8---58370926436.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3506bd25d---sizidewoguwawej.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/7uhra8v912ivij8a73c6f530ih/mapesurugurijarenuzal.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7fdb2b000---nawesokakubezebomila.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/1032988106.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c25f5d30bf---ruvugafakuva.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/d3dac06080cf0dbddb4306e5a6276c9e/wudovokedov.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/zutejazakuxojine.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/99283153962.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/vatukotuzobolegavawe.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1516e29a4---59488864569.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/2adf5a218aa442d93e732902975433dd/mapenikimosogutijuxawu.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/keguwopelogu.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/e56hjo8e484esospqh83r9t7f1/wozadakujevumema.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=crash+bandicoot+download+pc+kostenlos+deutschPDF 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_off000103b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B2 5364 bytes
SHA-256: 1036a982dd966c13ed965e6b066960b8d727f6d10a83c7648d3564c8e93870c5

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