Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d0c038124a15ccf…

MALICIOUS

PDF

90.9 KB Created: 2021-07-04 01:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d97cd3da827d65c8d809579bd5641d45 SHA-1: afc36036e097f0b4e134920131a0903a1eddf9e4 SHA-256: 1d0c038124a15ccf1b13533726c35dfd04a46905603b4c69e6d1705242edaa7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is part of a link farm designed to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/3u0fus55t87jnrs0i5m63qn2qp/4335891716.pdf In PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/25ba6f7b43461762fff92d5629b77cc3/75195234383.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/73451434476.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/9806197911.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/nodidifitadibajiwifuje.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/90130099807.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb9a49ffcc---76092791193.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/43958b9c6ad9e527d68bce7ec3c69d1c/bidawenarepo.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6368833c5a---saxegemajizuwafekojako.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/romulutegejabinabaxufoko.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/gitiziritililanogokune.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/difofejutof.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/sagezefezupijafawuxola.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/10015870425.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/35768740725.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/rudoginudamuxax.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be043a3019---33182928473.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609613b77d4d3---57031532300.pdfIn PDF document text
    • http://tmfconnected.com/clients/6/67/67cd703e63b47da0cba1438f70967d25/File/7421688290.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/52336653921.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcb94e79df---nudinoxesiwotubi.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/97502626741.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/gosobezubulevikefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=letter+to+patients+introducing+new+doctorPDF 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_off0000fd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD54 10784 bytes
SHA-256: b421402d3dedc4f2e5e3031ab7f3f6e78ae9d9f75969d68f3e2893601dad8d48
font_01_sfnt_off00011624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11624 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E36 17596 bytes
SHA-256: 06449e5256cb5cd272ca9faf3764bd5c646b051f69ec024d160f24924aac6fb9

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