Malicious PDF — malware analysis report

Static analysis result for SHA-256 b46c374c5b130d26…

MALICIOUS

PDF

93.0 KB Created: 2021-06-28 08:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cd69bb3cc2e3def33dd1b5fb404f4da3 SHA-1: 3d660b942aa816b593c9f0f1765ca3ce2ab0c383 SHA-256: b46c374c5b130d26bd01bcb3290e52aad5d72c67bf5054e6295562cac550a2f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to compromised CMS upload storage, suggesting it is part of a link farm designed to host malicious files. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure. While no scripts were explicitly extracted, the nature of the links and the detection names indicate a high likelihood of it being used to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9386e72073---10335548263.pdf In PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ea5fe85a3---10560584707.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/bonegudiwukenox.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b6662150285---67506697700.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/6p9a90huiocgthpdmuk8jas0hl/33528816695.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/fotinitosubureralurok.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21947b8a7b---83414999710.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/mejof.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7b8557763---nodidowonatofo.pdfIn PDF document text
    • https://tepihtrava.rs//files/kutabebubudemuv.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e8bb57f06---mipopujinetijumij.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/c4e9de4cdf5dc013c21c275383b93a4d/pijanosa.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16084d8f459559---8957461226.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/uirgq9o07nlqemde2o0ma2kn0t/monovadavato.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/wiguganagunikujipe.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0dfbe53c5---nimafigizelitasi.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/52f51e306aaa54e2b9fea6f04c2f4e72/wemojofinukadadekuvunux.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/gumorileruzozudosuki.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dd1a024ca---72368868774.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/11454762352.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/fuvisoweja.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/2897080656.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/11029900508.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/18451207975.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1a5ccf297---97879532567.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5a0caec4f---gakatulesawixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=notes+of+chapter+executive+class+11PDF 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_off00010926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10926 16916 bytes
SHA-256: 446b2bca2fa84ff51849565b08a5116923f7eb38034e05e3869a286ed537ea78
font_01_sfnt_off00013543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13543 10768 bytes
SHA-256: 13a12d0d63e3389b5cf49682f602505161c3d6a71a5482cfd1fb30ebe0672e1b
font_02_sfnt_off00014e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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