Malicious PDF — malware analysis report

Static analysis result for SHA-256 f65e143fde8d3f4a…

MALICIOUS

PDF

85.9 KB Created: 2021-09-04 07:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 8cb0daa5f46aac8f1ba75acb8f6945d2 SHA-1: ec9fa32441f34a2d4aa1184fa0caf006ffb8c348 SHA-256: f65e143fde8d3f4aa3dc67fa3a256e9e7b2916b0401f19c478859c161600fcf8
104 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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 http://nbpcpentecostalchurch.com/clients/65183/File/kemefexiseledigerut.pdf In PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a1126677ac---kukumapowabasazizi.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9e237928c---51851895217.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/pcesnk8dkknpqtdbdkicikllg5/28790959387.pdfIn PDF document text
    • http://quaint-house.com/12980548463.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81edf1ea91---bexivapadoj.pdfIn PDF document text
    • http://glenbardwest1965.com/clients/0/00/000b938fadf99fc3242526d4297efebf/File/84153925774.pdfIn PDF document text
    • https://mimpiindah168.com/contents//files/poxevijinimafin.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae70d50919---4813327493.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/ribonogawulakax.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/posonobexevixupumifaxedo.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607689701a1f3---bevamupineterani.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/xadularimesibonugemes.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/12628516095.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/lavuk.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/91583293326.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/347208f217d9e185df88c0498b083ddd/kuzuwitisadepijigeser.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/92891402699.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160db1aba3993f---42685263230.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/92706359640.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/19204704645.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/7b363301869dc62fb034920f7d163b86/21347521394.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac88d64c7d5---xiroruvodapukan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=exporting+excel+to+pdf+formattingPDF 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_off0000eb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001036d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036D 17388 bytes
SHA-256: 950a7fe6aa5dc455249f993659bc9aa96de2ffe1b4a329732e61947553617693
font_02_sfnt_off000130d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D9 10880 bytes
SHA-256: 2a06e57f109643d9821bf918b6bc41d5d8946da56d3e88d80c9d14815bcf8856

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