Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a99e63a5be60d28…

MALICIOUS

PDF

98.2 KB Created: 2021-05-02 17:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b295ae508fe41c08b0c1446b960cb3ff SHA-1: e6188f8632512a4db9a29d11a05b791e2c69d375 SHA-256: 1a99e63a5be60d2856e213716b36f33ecb1707b8b0ed59e6e075e51cf0b6c681
174 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's used for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URI heuristics suggest it may leverage embedded JavaScript to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9725

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pbqiqt44t9jh4ldnur2u4ua3h0/37498596904.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f47b514245---wimuwakazoralonuji.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/77h8pcagp78i0u34d3ff491dj8/wejitokiwexexazosiselava.pdf
    • http://nowyhotelik.pl/userfiles/file/53207129218.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d357200031---22910609467.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/e55fad75d8a71b6514f0afd8cd8d2e2b/38527091911.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/b6c4s8rmio2088qf848maio35q/lugonufovejewagoxagukaxe.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecf1d9e716---tuwazipuzokamoman.pdf
    • http://africa-emergence2019.com/userfiles/file/dakekutulivuser.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607213c0948e7---75809410945.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/a744eea9176ed86b09bcf6bffffdafd9/20783217428.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/932b09019f38fb78427e5439dcee9f21/rovebix.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794bc865895---86716208156.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075bce1ee88f---donowididisaxono.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/uvablqcan5a8d4tv40s9q01bfg/26540388403.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/d6e4f35d3e590edd1da6ea4b6b66f248/30407642113.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/69div8pgnk1gl5tnl3e7sghln3/gusudimujifabutisaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=o+abandono+escolar+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016f5e.bin
e149df9c052fa74fd7ff60096446145f014001db5a127388995f79c8526f1c83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16F5E 5316 bytes

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