Malicious PDF — malware analysis report

Static analysis result for SHA-256 c850e6217958761e…

MALICIOUS

PDF

91.5 KB Created: 2021-09-02 00:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 68bed4000ec225cc3efeb0d8d999bcfc SHA-1: 1034389af65b1b07b2768983022221496f559a95 SHA-256: c850e6217958761eff187293b1de33bb6e6c52aa797d233d504789c606490e1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains a link farm pointing to multiple compromised CMS upload storage locations and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://accessiblevehicleservices.com/userfiles/file/xigelogunefikigupere.pdf In PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c772d5d70d9---30645773160.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/bdea8b97ce91aafba7015f67528611ce/duwufovitimaberawalenis.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/o0tt2mcp2hkup5nsfg62d3ljs4/31607113181.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/202f83f2be263628e288393c56ea2248/nipufezatanasumowizezo.pdfIn PDF document text
    • https://majubesar.com/contents/files/bapowopapiduxare.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/fepajezuxebabilunuze.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/wibinasipulexe.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/fuwemejob.pdfIn PDF document text
    • http://reichspfarrer.sk/file/86701756884.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/zopopoxipewidokozosoxuzav.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cdcf922da---74864061375.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/5614378606.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210618_92BC011A9C6575E3.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160900d7a8312f---towejufuz.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/cjtk9gmvigl66g7is834qvst81/58832684374.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123413992606---jogefew.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d6b122eab---noroxizikug.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210623111807.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/6290876553.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/86620728000.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/12022666522.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/a2e26c12570b20fddc76a751b68e2a96/bogemuzamojuto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=multi+point+perspective+definitionPDF 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_off0000fefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFE 18192 bytes
SHA-256: 9ef57730860ca42adb127aba2e8049bada06de19fe2cb7728fb57c8afcf72a1d
font_01_sfnt_off00012eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB5 10608 bytes
SHA-256: ae8c51509bd1ad11a549d2ae3227d2626285218a191ec3852ec2bd9bd41482e7
font_02_sfnt_off0001471b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1471B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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