Malicious PDF — malware analysis report

Static analysis result for SHA-256 66da7b70eea0c0d2…

MALICIOUS

PDF

75.4 KB Created: 2021-05-02 10:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 63b5464c6ccc7cc95c29548a4bf5bb45 SHA-1: 00ac643cee8dea74e3af9c7bea255f32ef691430 SHA-256: 66da7b70eea0c0d2317046e307dc40f1f2dc5c2b2731c50b824047957c13323f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, appears to contain text related to educational worksheets, likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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 https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f153b1fff---7115665825.pdf In PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089802b3fea0---gomijogepuv.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/44v8oprf85oiskqvj7m65dsire/guzosamoxuma.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/1dfekvhd5vi9vl5vkee8dak9ro/sawadonosugadiwonepa.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/35se4slvji01e7c1c5sfqlkrlr/83472749068.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/1jicgejumqmlr4ubl07d1d3ujr/pedusiguruzopujix.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607603b64eec7---78728300383.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160713366c706a---78392819069.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877a3469cd7---11168794138.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/sdtuuk9h0t939sm621dctvmaeq/84976913238.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160809b515f598---wibewonaza.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/qqavggcol84sslrkh1f36hjfff/bebabibet.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16084b8ca7ed85---kelivufaxuguzisudawega.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a09cda168d---10270661716.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/39dea2ca8f28a0d12d735be75e42fea8/gegepowadimagezajo.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608788866bf2d---35436577427.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3ac82e0b7---genabakuregit.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/a9b8gtckfukq68n1kbe08hke87/97241142278.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088e14c13af7---tawijurixivilomizetol.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/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=conjunctions+worksheet+grade+5PDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F8 5432 bytes
SHA-256: 8aee70298e3e5967139568f34e9ad898e4d45f874d448fbedd854dbc4a53c0f2
font_01_sfnt_off0000fb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB80 10688 bytes
SHA-256: e392e2218d522f0e620fe5a901e2c70313247ae678150a3a29690769a3ea90fb

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