Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ba84eabfe32d49…

MALICIOUS

PDF

84.4 KB Created: 2021-06-29 08:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c0b402b8ce11cf4915ca2bfb7643917f SHA-1: 6e59db3d593d08a7ff5c5916c3ed21e50cc73f1a SHA-256: f1ba84eabfe32d499f124b5b028296d4803cb5c991d2c53efdf99f7c6a28d4ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or SEO manipulation scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • 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 http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ad92801a4e1---vafosukokutodaxusewo.pdf In PDF document text
    • http://coytex.net//ckfinder/userfiles/files/21986361727.pdfIn PDF document text
    • http://emeat.ru/var/files/69827493651.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///xezepovokaxesojatoguw.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/kegoledikemo.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/somolidedosufijeso.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/4cedc3547f59b1e1ffaf845b656e9fcd/fotozudo.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/84529496001.pdfIn PDF document text
    • http://afslab.asia/upload/files/mabazimomivosuf.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/63369eebad51a1f604ac3935c0750ce2/joxas.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/17438315748.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/jixapebiputunogoti.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d9f3b6e3f---finotoxawakor.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b535a69b6f2---nawisope.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c944e31e66---fibuwimupejizomumofo.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/67e281e6c4d741afe6944d4359969a48/69753195934.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/85239223708.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/8188cd956133076152ba624e1e649765/74971642645.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e55a3f166---23198710578.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/d42367459343d5c31198b4154feb82e7/82223663858.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/50930311b180a635190a5adff6b26a72/tusojujirizevo.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072473be5e8e---86614240447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=design+of+connections+in+steel+structuresPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97A 10448 bytes
SHA-256: 7d3eb05c7c100576c322626530a286c20cd432cea9f930caf82c70bd5c451753
font_01_sfnt_off0001015e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11970 16532 bytes
SHA-256: ee7ad5f2e5a8a3a0dbb26fab5910ef1fe496b73f524c3e20b49378a4975bdacd

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