Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbbd03fb134796c8…

MALICIOUS

PDF

82.8 KB Created: 2021-09-03 04:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ea78fcea80b2d61f5790bdab452a64ce SHA-1: 101290b6c9d92cbaa5e1fbecc7b6fb95f26dec57 SHA-256: fbbd03fb134796c8e4df06be4fba8ebb32d29d6354e8fd487b7fb8deac73421f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The file's structure and URL patterns align with techniques used to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://championsview.net/userimages/154793576.pdf In PDF document text
    • https://edarky.net/data/file/werelalogulif.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/dinezopo.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c358af3e61f---75172946349.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/poronazimuvaraziloxodux.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607277562a502---pazofegaxodimodowum.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/35216938286.pdfIn PDF document text
    • http://szpk.hu/_user/file/1615015368.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c19ccc2c637---vopepobizofutip.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c669beba6d---20070230433.pdfIn PDF document text
    • http://weingut-suppan.at/files/vixawademewudoxekinat.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/jabijomedaranek.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/85114418593.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/xaderozulesarotemekedoze.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/13341094216.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/78e6a32036ebe6ff2da383a19d8feaa0/28298444450.pdfIn PDF document text
    • http://maihome.hu/admin1/file/baniperufoluno.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a6bfb6cd21---jizukagafoxufamepexine.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/vuxoxu.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/14121821194.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/futikitidemoju.pdfIn PDF document text
    • https://brod-plovdiv.com/images/dufoxexoxaruziwesikovej.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888d2e08946---96526809900.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df8303a247f---71579783303.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/45323345701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=oraciones+subordinadas+adjetivas+para+analizar+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_off0000d6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E7 11132 bytes
SHA-256: 5d386035a86f0af188bdb73d10733b6efe6d53e765417a5ea62ff00454dc2fcd
font_01_sfnt_off0000f0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D7 19844 bytes
SHA-256: f6effd3c5c29dcb51a6e0a4f02f733205f566564ac85a0611efa6392190e87d9
font_02_sfnt_off00012353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12353 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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