Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac816ba208666ab…

MALICIOUS

PDF

93.1 KB Created: 2021-08-16 06:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: f26a186e14ee2682c3a25d81ccf2b50c SHA-1: c277c23321b11f53a96d747cddd9f2ae7b13c470 SHA-256: 8ac816ba208666abc096b682e2e21dbd1ac93b9c12db6c318d3daf6bc7b937e2
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 0.9979

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://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609db06587438---vijafo.pdf In PDF document text
    • http://jr-bang.com/uploadfiles/20210717062421.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/m28o0rj950c1j7frf6jh48je3v/88297645587.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ec515547922---likewuj.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fcfe19899---jawepud.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/kibijatapuwagozukexuj.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/91516943503.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/2b31aeea240bbdb84fa5c649543c74fe/fakuzoxiwaxitok.pdfIn PDF document text
    • http://effektfilm.de/files/file/33159638746.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/8957980781.pdfIn PDF document text
    • https://interface-graphique.com/upload/editor/file/pegurapodixet.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/49119332286.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/5fb3d6bda6e85613b8c93845135ccf15/wuripu.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/witexadomuk.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/8cea3cc489dcaeca323d6e3be5da850a/nuleriras.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/6b57f036ca315273c0b11f4bab1abe16/61801915737.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/55369013672.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/df322fb48fbcdf79156f025f0e3d45fa/20446195325.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16082d33e5c083---kibabuworotigowezibuso.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/a78312a5acda71cda8c72be45b5f59d8/logemesevimu.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/jiwize.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/zelijiwaravugageligomaj.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e469ed238---74975737106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=united+states+government+our+democracy+chapter+5PDF 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_off00010625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10625 11336 bytes
SHA-256: b1090aeac4df183150eac0b3bc776cff70e756000cc78cbc7531050e99bab70d
font_01_sfnt_off00012089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12089 17208 bytes
SHA-256: 6e2c82ce683f1b83d31804c63bc62163644f6624a2c91bd98b9583e10c52a3a5
font_02_sfnt_off00014d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1