Malicious PDF — malware analysis report

Static analysis result for SHA-256 762ae688a40f8d1c…

MALICIOUS

PDF

66.6 KB Created: 2021-04-29 00:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0263e919f3578ec6141718a7d9efcf8 SHA-1: bf571ddca37083966c4a165d081a25b9bc14772c SHA-256: 762ae688a40f8d1cffdddf7769cfc32c2db52f6645a12c6a2b5f16a83ee47681
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This behavior is indicative of a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8377

Heuristics 5

  • 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
  • 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.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160757b1f330f2---2310413096.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9fe7bcb4e---2095184666.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607191fce5af4---29708876065.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/9ti6dv1jl7q8dfmfs8rg5qem64/betukirox.pdf
    • http://anhbanglaw.com/userfiles/file/bizove.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b22889c68---zawevatakumakasomidukubiv.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/0r7jnou5gfqko9o2u6bokkdsvc/rewonugufa.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/bvvcool1876lvkonkt0khj77t8/25724246049.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/88astcvjp5ubjjndtoqm3k05a1/27247344918.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/4uuqmovpk2dnuug2emi045u60k/73020394240.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075e15a8810d---53644643393.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608641c99ec09---vibevipajak.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/tkvpaluiu3i7i9j28uj1j2ck5n/zosaguna.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/59bae48fad8bd1849b73bf8be2ab2cdd/zokexugezexapesesuraluf.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f42a49a18---99363534289.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/ajmljphq28h8ps4n34btdhrggh/lonub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=cacti+for+windows+server
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea0c.bin
820ec11b361defaeb01a9c7836d6f45e00920521a75b273b8280ff4fee9cb0b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0C 5040 bytes

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