Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5476d07aa287b5e…

MALICIOUS

PDF

84.5 KB Created: 2021-08-16 08:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8253f43411a53c153aa94c920b57fa38 SHA-1: 1c4475ca8398dac8dddacbdb914e66f46631b867 SHA-256: b5476d07aa287b5ed03a95d3e44fc9aad4e24e07e4cac69cbd7be0842dfe86de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content. The 'utm_term' parameter in one URL indicates a lure related to 'shark fin trading pdf free download', likely to entice users to click through to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://geose.ru/userfiles/file/34680860773.pdf In PDF document text
    • http://orthopediedelft.eu/files/4318727859.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca657a7152---13585398749.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/5f0dbec5854e71f02fab43a5455ff590/22822147202.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c05e7bb02bf---masedaraji.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/6d45b1158c43e4e0e27454bf5ed83cea/40145552550.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b16d8f5d9c4---ranadekimewo.pdfIn PDF document text
    • http://dsagco.com/Upload/file/kesemiwokajakovopewured.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/a77113b2ce09e00288e4c0d79b26b814/67947836642.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/wexabutuson.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc29aa9d120---nofen.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/rewapube.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/cce8462a2b0aa92c5822d5c1fe493765/wilovasavu.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b47bda5aa---paxokadutanavedamof.pdfIn PDF document text
    • http://st03.it/userfiles/files/63474524209.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609223cef21a6---dodoroziporanajab.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/dfff8b9873c0b1d3293af38d1c03fff2/34769630181.pdfIn PDF document text
    • https://ahha.az/userfiles/file/81438162403.pdfIn PDF document text
    • https://anfauglir.com/images/file/wemowopiwikosefu.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/totisupurasawegakarule.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160deed7e72082---71051357953.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780be414833---89417623471.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/vetagag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=shark+fin+trading+pdf+free+downloadPDF 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_off0000e2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CF 17944 bytes
SHA-256: fc354415264f45b103642adf2afafe5110e495b4570090c8e2aef56adf4797a1
font_01_sfnt_off00011203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11203 10864 bytes
SHA-256: d2e056c331378d7ac139de4fd628fa9494619a3d9fab63d05e6c8ea56030e018
font_02_sfnt_off00012ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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