Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c861cf236f7fae…

MALICIOUS

PDF

69.2 KB Created: 2021-05-16 11:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 010150d10dab10c23ca9a1a55facfa24 SHA-1: 7232f51724c77ed08bc19d8094b9ff951ecc5bb8 SHA-256: 77c861cf236f7faeb20cada0099b6fa7824cc768bcf879e4156ffbe7384b5337
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload sites and other disposable hosting domains. The document body contains garbled text and metadata related to 'wkhtmltopdf', suggesting it was programmatically generated to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://daoltrading.com/userData/board/file/558762336.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/aff36113a947ba7fa9b996bef4d86fcc/savos.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/96689ad880fb275c8e5862492cef2765/27534964861.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/ee1b963093dbed67bd26bc6323839a04/xejuginavoliwute.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c987131002---28495574394.pdf
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/318885746f9d194ddfdb1296f03efddc/29483737747.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/40f8901416a6933938033469a3c98495/57264651624.pdf
    • http://alimentosldm.com/userfiles/file/fugikurerubukewiburoba.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/f4798dfa4b85cb3de8c92e1107fba373/54095585568.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841bca0eb8e---tetusilevevunotolovogifu.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071310b7f8fb---dasoped.pdf
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/7a669623b636fcb69295a2fbb0bc1025/54065853389.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829c27e5805---kozijekemudadagikowixix.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/vtn3ngini6oqgqg1laus2qmukp/22199139810.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/939145468abb0afc0a366baa23fc717b/kawitusemupuzevi.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/828037419dee8bcb03f3c86edfb0f2ca/57360133759.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=post+3d+photo+facebook+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1f1.bin
a1bbbe9929045dfdd892326444ef52a508c22f8f7de488fb4fccecfd78ab46d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F1 5580 bytes
font_01_sfnt_off0000e4de.bin
7662a81610958a5fcd80bb495acb554ac53076106164326428755dc8c054788a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DE 10260 bytes

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