Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f57dc6d63dd4a40…

MALICIOUS

PDF

113.1 KB Created: 2021-07-21 12:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 52573e1c5d9ffbb63eefaf15b2de2464 SHA-1: 20a90e7a2fd9b64f9d9031ee889a32054be21907 SHA-256: 0f57dc6d63dd4a4022b64373adc466d086e8603de3e39fe663b507e68d3b9a0b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites, likely intended to lure users into downloading further malicious content or submitting sensitive information. The presence of multiple links on disposable hosting and compromised CMS upload storage reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://jagatjyotischool.org/jagatjyotischool/userfiles/file/tukixilaxukilogupap.pdf In PDF document text
    • http://skolicka.eu/foto/images/file/85669496778.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/buguzosofirevena.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16078b978454b9---vexazaberogatalelatapo.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/514ea3c6c51474178b9d95241423db70/45428952264.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/18709856586.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/m9k9e2ben2s1s86mqrhu7piuj6/morej.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b296d08ebd4---64327588284.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/67687836081.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609f61d9f083b---22738919816.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/wogotusorewuwet.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/buwulonetazavuzurelapopuk.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160db790c8932c---dozukadawejolan.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/1723246551.pdfIn PDF document text
    • http://signauction.net/userfiles/file/93533361842.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/d249308978492232258076c62eb32c4a/tasalunujimatemolenadaxez.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082dd6a23d38---rukezazo.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/bizufajexodefajeg.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/17347518538.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/11595244914.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/88520588403.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/81892977775.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/45df8f757bf81d00226ef827a6a77d0d/50401492767.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/d5cae96e23240fb0b74885461cb1b93d/kagegixojapumabupalerox.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/fagudobifotomanuwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=space+invaders+unblockedPDF link annotation
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F0 8076 bytes
SHA-256: c3c20dbf898972ec152fb029aacac9c34453fda4cd778ad64080a8a6930b51d6
font_01_sfnt_off000135c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C4 10884 bytes
SHA-256: 4befea104318ea8b60e48b151e3da8b3011f8e48fd4feecc278c8e38c818e6bd
font_02_sfnt_off00014ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ECB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000166dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166DC 16736 bytes
SHA-256: 20081155e1a348952d61e0d35749f89d757567b1d6b968b3cde9f9d1ecb0bcad
font_04_sfnt_off00017ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17ECB 20120 bytes
SHA-256: 5040a18ca9717c26115a4e5855e17b17028493fd8ec91ca3df4b742ca9261608

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