Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d86c2777acdffde…

MALICIOUS

PDF

68.1 KB Created: 2021-08-11 15:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 88d4b8cbe532020aaa0f498577a1e289 SHA-1: 5879a5e1f9f11d39190ebd69d09aa5ed0947846e SHA-256: 6d86c2777acdffdeda5815a5accca9113b9ee14c4a073e9cefa50c621f816ab4
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that functions as a link farm, containing numerous URLs pointing to potentially compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting and UTM parameters for redirection, suggesting an attempt to obscure the final malicious destination. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9448

Heuristics 4

  • 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
  • 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://garglob.ru/uplcv?utm_term=watch+sultan+full+movie+on+dailymotion PDF link annotation
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca41c1e4af---18299211104.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/salowizubafitagosuxe.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/db0b2e693a0e5617a24c41f436f1390c/fajotorafemavikaguvuk.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/88339340434.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/78927176041.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/labagokewewajemika.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9eede5369---42039929425.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/7dd4891ce5404af25670540e50173166/varamenolijugugadusoxemu.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/48507706883.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/m6dv7r3vmfsm5v9kdnbqekb5sl/5902138320.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210601050330734706.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/20179368056.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916f11a0a13---11064781978.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c809e3858---wejifube.pdfIn PDF document text
    • http://pandoreunion.com/clients/81456/File/49686044324.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bb1099303---fosutodiwisuvi.pdfIn PDF document text
    • http://espokebar.com/uploads/files/23970840821.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/27981868860.pdfIn PDF document text
    • http://onestudent.dk/userfiles/file/12016295224.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/52429271006.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/5507948533.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/27ca8bf38e4c018d24b26adc1b3df3ff/24935543552.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF97 10912 bytes
SHA-256: 045dcd19514f28f955a283ca19b796bc356703eaceee04678d151e68fcb61364

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