Malicious PDF — malware analysis report

Static analysis result for SHA-256 61be6e9e4f4e12a9…

MALICIOUS

PDF

87.6 KB Created: 2021-09-04 01:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a30fd50885de315ee8a99460a17656e3 SHA-1: 4a82fab2ffe85e3ee32fb95939ebc2af241f639d SHA-256: 61be6e9e4f4e12a941ac369c03bfcf87d2cf2feb4049af262b43b2e03068d63b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://playeasypiano.com/resources/fck_images/99511229082.pdf In PDF document text
    • https://angkoronetour.com/userfiles/file/38180371049.pdfIn PDF document text
    • https://nicosiacaffe.it/file/28034258952.pdfIn PDF document text
    • http://haphadoor.com/upload/files/92134513881.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae318d6b8e0---pekomudafekafaxuzilalanug.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608add276c2c6---2507902471.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741e2e18ad3---mujipazala.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1612af02a88712---pakaravefikotiwetiridud.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/10505437404.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/rifizo.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/21318807420.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749e0f82470---99186809131.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/rexujopafuwapugejodet.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c968d71da3b---xazobidusufixuzuzatan.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/56463543600.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/kalabuj.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/vozor.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820bfd88a59---96054414550.pdfIn PDF document text
    • http://fuli-capital.com/userfiles/file/39987935078.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/3edd8b1d81010a5d4af72ebabfe740ef/zobovoxefo.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/bibaf.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/41243282540.pdfIn PDF document text
    • https://riwg.in/userfiles/file/24847192912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ceremony+silko+pdfPDF 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_off0000f29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29B 17972 bytes
SHA-256: 6b349d96caf3355c4e8adcac90cfb2ee98ad99d76232dce447e255145b13be33
font_01_sfnt_off0001211a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13931 10636 bytes
SHA-256: 5b4b22b1e4511dd8386c13fba537183719a8e80dc012553fa8bb26dd26d1aaeb

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