Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc65863d5e0a903e…

MALICIOUS

PDF

85.6 KB Created: 2021-07-30 18:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 5220f795181187e27e67b1b9ef3ca88e SHA-1: a00cd6512faee969b65999b3cd11ce8824ad6bb1 SHA-256: bc65863d5e0a903e722bed57978c9d563e47b40e417dbc08c8a7f8c383d63e18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bacf986d731---kakuwuzus.pdf In PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160731c83c6f97---kafurerewiredakupuxiwim.pdfIn PDF document text
    • http://lucavolpicella.it/userfiles/files/73318866277.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eca54a1c48---59036669304.pdfIn PDF document text
    • https://togeltop.net/contents//files/tiposukaralijazer.pdfIn PDF document text
    • https://hgb.se/filer/file/zoteneguxagolefuno.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e66f1c079a---23483665873.pdfIn PDF document text
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/zunuse.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/48dd25c474e2b0afd4660234c6538673/ragufasizukavefedo.pdfIn PDF document text
    • https://migger.dk/userimages/file/14288380197.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/45609030878.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/506f6029fc8a50eac07590ae2f1d72e4/gelatudivogirawura.pdfIn PDF document text
    • http://malifer.hu/upload/file/50678263763.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/37957783292.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9dcd480c7---90752780085.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/janemolixefegefodemudedo.pdfIn PDF document text
    • http://sam-global.info/files/file/91768005712.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/gubuxadeko.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/vekijubukemawukuzet.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/94011766764.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/85276965901.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/89779096.pdfIn PDF document text
    • http://prestopc.it/upload/file/94626898765.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=software+testing+life+cycle+tutorialspoint+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_off0000eafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFD 11172 bytes
SHA-256: 40f43df222e8623dff3c46d7295181a88003b7343c226c4212f982ef84fb6346
font_01_sfnt_off00010516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10516 16636 bytes
SHA-256: e17ea9060ba568e7ccfb2f947ddd61568cd2ff00befa013318ad7427b939f71b
font_02_sfnt_off00012ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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