Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a4d0ed54228102…

MALICIOUS

PDF

61.2 KB Created: 2021-06-20 22:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 2a50e18e09387363a78eb45f27e8b2d7 SHA-1: de6fa2f0abadb9332be87e1c30701fd93dbc2cd1 SHA-256: f3a4d0ed54228102f5ad03047f3580d57eeb26e34265260d787252cbd42f2330
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the presence of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9395

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 http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d18e889c1---90064634849.pdf In PDF document text
    • http://alexlunacoach.com/img/editor/file/94244114209.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d0786087d---gidefazabivunusi.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/c5jfotic375cor1bq6udfrhfmt/79692867822.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870cdf54ef2---wiletuzebuzebevamu.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084a3e6dbf19---morudefufoxifaxajon.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a7a21d668---bojugemopojiwefigoku.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608871d4ae8da---bufomowujolufabuwez.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b92b79e5e49---34907938555.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/31638585908.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/q4ak4fm522bqdddj1gah1ta7n6/muzujapajaluj.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/95048266121.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084ec9a829d7---terigatafudobulakukevus.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/rss20aurkv3c0dsg4lddbcg1oo/muxezaf.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/35568a672d10d056e3c9e92959ce4664/kijuwovobes.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b821463f848---23909166025.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/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=pico+x+chico+x+cocoPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C9 3924 bytes
SHA-256: 58a4f8933d88b8d313148116194e3ac304da9263a557420473a496b1f9fe4414
font_01_sfnt_off0000c6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FE 10800 bytes
SHA-256: 6e3b1ac60a6dd8ec0be0a2a5dc6b9fa409729f016ea313d3bd1c98fee9a5bc54

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