Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8af39d3efe42c89…

MALICIOUS

PDF

115.2 KB Created: 2021-06-10 22:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8f79287c8477ac9a4d407efafd8f3cd8 SHA-1: 36ca28789d20494004a60076b683e2de9c6b935a SHA-256: b8af39d3efe42c893f9953675d05ac27e240da894a38890472e23cac8e70dfaf
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various compromised websites, some of which are hosted on disposable domains or utilize WordPress upload vulnerabilities. The embedded URLs suggest an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://philabc.ru/uplcv?utm_term=kingdoms+%2526+lords+apk+hack PDF link annotation
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/6ogidcatei3c71nbqonul923t6/tatuwewuvumuxasufi.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/5c94b2d2531bfe0f0c5486dedbaa9d35/17734289147.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57c5fa6466---28760244834.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078c2f68332f---68051266160.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e761b5dfe0---30196844327.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098919b59303---5598527265.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/kuxisagibew.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/ilgapjo9o3gf0dvubbvrcrpga2/rudukeruv.pdfIn PDF document text
    • http://altinay-law.com/images/file/fawibumudupo.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/h40h0pme00e7tabqotcr66mmhs/12505916422.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/7971468596.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4d2f97f70---92313875405.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b856755af20---4665232328.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/4bn4erhe5vff5qjiuo24034t73/buxakom.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e273fcb3989b29ccdaff2143e8ceb187/vajaxabojeg.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2e41b11d6---kujarelular.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000129b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B0 6588 bytes
SHA-256: b3260a8b27c40a1c9408c40b3dcfb9ec9ded560232013cbc1ca8de37ebb5a831
font_01_sfnt_off000139fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139FA 19952 bytes
SHA-256: 221ed77d3f66b62cd411adb6e151a0879f2443fa88aacbb4beb00ecd1408e278
font_02_sfnt_off00017a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A79 4768 bytes
SHA-256: d2560f9da1e4ce2734d19f59982c28c15f3af54ab492b1fe1bda08c8adde445f
font_03_sfnt_off00018a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A9F 2904 bytes
SHA-256: 54dc924f879ed509c8021f36815774a7bfa81c2febd7cedcbd7c573b524f6ec4
font_04_sfnt_off00019695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19695 11856 bytes
SHA-256: 53f0b9d696767cbe6174050378cbe6bf4da67a881f48455735bd70a960453041

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