Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eda53d845686c46…

MALICIOUS

PDF

72.2 KB Created: 2021-09-04 00:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 453422e68abe647cb69ea58bf3706e0b SHA-1: e4f6e76f6db0216176d5022eda4060029645c2e0 SHA-256: 5eda53d845686c46e925a95a35aed7d8ab51ce7db9ddf2151e10d277e7eb53b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to potentially compromised websites or disposable hosting, a common tactic for phishing or distributing further malware. The presence of multiple links hosted on compromised CMS upload directories suggests an attempt to leverage legitimate but vulnerable infrastructure for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16106465952674---puraze.pdf In PDF document text
    • http://cz-synergy.cz/data/file/17188673029.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/91236831703.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/69373485811.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/lowapojebosapibuxaweb.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/77674784377.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efde83e5d2---34017543552.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/pozixawuvefejegaxos.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/6a18cfb8a2fc387e058e9d6229fe6d9d/9714970821.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/kuvapeti.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/23560910724.pdfIn PDF document text
    • http://bryanhigh78.com/clients/72554/File/58527648581.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/968514c2c17c6354b3c3d55beea884fd/48943034812.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/samulixazasotujopu.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/gelobakanizozokijup.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/17523565514.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/91716269559.pdfIn PDF document text
    • http://vuason.vn/upload/files/82000270623.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/coq9dvmm2n6l0cba1c6mf628oc/55916144366.pdfIn PDF document text
    • http://airsoft1.ro/files/file/88396348691.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9b45e2c75---51363248833.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160f0654ab0034---rivero.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/kajesonebalevujolugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=writing+and+solving+systems+of+equations+worksheet+answersPDF 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_off0000b735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4C 11396 bytes
SHA-256: 5c34933ba7a3f60e0bb6909b41188e3fce28a0b830e72b0bbdcb0aeb755f0dcf
font_02_sfnt_off0000e98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98A 16124 bytes
SHA-256: 88cd7e5f675f5b3f37801668abd31385e31b77c6037de72c82d199b19ed9c089

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