Malicious PDF — malware analysis report

Static analysis result for SHA-256 2454c57bdbfac419…

MALICIOUS

PDF

99.5 KB Created: 2021-07-01 18:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9c066392b52ca869408c2f9a438eabb4 SHA-1: 55fd5aab53fda26ef8c1c8e752edb224d8680f69 SHA-256: 2454c57bdbfac4190e008ad4192ff00bbfe06b9829961ab07e49f8a1f1b1a1b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9789

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://nomylo.ru/uplcv?utm_term=anodyne+meaning+in+english PDF link annotation
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acd6dab05c4---nomutew.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e9451538f---35165341014.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e995e648f2---raxaberogodadufisukipit.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/pusozi.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/42754041063.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/d6238d52f4c9a1134eb88a2f8aa03e37/33552177494.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e638b789---47083659293.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/9487196883.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/jebutomojajafegar.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d64e01e28f8---38786403794.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/4vf85o1ji9nqlbg3fv6kn2sai9/wukesafotisekevozuf.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/bef9e8719e1ff032e1fe3efa75fc8a90/juwobozuge.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/27t6ctc6f21l6v52l2385b7uu4/sekira.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/fd1fc47af86887cac3b1f8c7792d4c25/58849953408.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/3ce0ab5b6075b6c6fef313ef9e83567b/1504597683.pdfIn PDF document text
    • http://kalikraft.com/images/file/piwofulofuwovegeb.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/01a33aa0e9bc26e6b8640871a773d4f0/jowejizogorobuzuvuku.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cc85ed722---kixodukej.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/vudabifelujovugesuja.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/fedanadilovon.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/zudomumeludejipifuw.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d3b214da482524fe12b5242dff535d90/ragekodakatusaparizu.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0ada8c055---23502634722.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/bakodilojoz.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abd86e0184---71376619052.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18C 23088 bytes
SHA-256: b48db46df4a5a4055398b8a341736cad6d84c65589f751e682e4d920c805efd9
font_01_sfnt_off00012b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B57 2736 bytes
SHA-256: 9c516d4baaffcb2501aad23429d3eac139c82d456d5879b8bf401dcdb7de000b
font_02_sfnt_off000136ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ED1 10592 bytes
SHA-256: 17d8ccd99f55c6f184ac53b3ed4925e797d6ba1a5ad82b6abbd47c55b49b1216
font_04_sfnt_off00016693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16693 16672 bytes
SHA-256: 055596e683e0a1d6d3976cfdbe2a02048c377251119292efb43e451c27e34527

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