Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b74767a8b0c78a…

MALICIOUS

PDF

82.0 KB Created: 2021-08-19 05:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: f4f9964206e4d9a509ee4b3ef2d467cf SHA-1: 140365363dd2ba397e2c22ccd59f93555c7fc603 SHA-256: 75b74767a8b0c78a28bd57e958490b9a8bb50bb44f5c6c936616c93c8f6ed262
136 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. It uses a password-protected-archive lure. 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 0.9977

Heuristics 6

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://medvor.ru/uplcv?utm_term=how+do+i+log+into+my+hitron+coda+4582 PDF link annotation
    • http://wonsakai.com/uploads/files/livogamixiwegum.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/magiwaturetoba.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/3501200191.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/rqr6up2f11hgrd921c1meo9li5/zuliwowubesuvonip.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/0366d352a2dc108bf685dd0cbc99df4d/42079004873.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/kosufakadazilagunoboza.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/89071991887.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b3be2933d549fe682de3364f2464924a/zevixus.pdfIn PDF document text
    • http://runo34.ru/attachments/file/ragonodoraruvedof.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/21147199190.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/11vicihe0r5lkdunb7ctdofg73/lixinorovun.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608537597f51d---69355324463.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e195f75d8e---25268227536.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/12590196758.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/ab5ae1a09cc4cf097f12a7941993e0be/29022102787.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/58990659237.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b38b9de7---vulutufoxasiz.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/navuni.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/14566432152.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/dixidusetilomejagivenaji.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/80dea0669908039b4bef59e79d762485/13741535704.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/gitqc6au14hobv0udsvou56vh7/67313287947.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/denefaw.pdfIn PDF document text
    • 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_off0000d9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AC 17976 bytes
SHA-256: 7c800cfa3b527e0d4103b1536ef4c15c98fac654fed77028d07a34a4fcda0b19
font_01_sfnt_off000107ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FF 11248 bytes
SHA-256: d784001f4c134072876555878e411912f3319ba3dd9a14317a1b662e207c5c50
font_02_sfnt_off0001221a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.