Malicious PDF — malware analysis report

Static analysis result for SHA-256 b259d113ff047ddb…

MALICIOUS

PDF

77.4 KB Created: 2021-06-17 07:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1df44382f7b738944c284c936379ced8 SHA-1: a6c0a43e75a46ae28c7da42fd05f2d582afb244e SHA-256: b259d113ff047ddb0b527631aa0dbdf4b07d899f15131f93a737c33b6ed57fe7
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting domains. The primary purpose appears to be redirecting users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://infrive.ru/uplcv?utm_term=libaas+song+ringtone
    • https://medtek.vn/storage/file/duvopurobo.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9d5feffce---boxoliro.pdf
    • http://mdc.ir/ckfinder/userfiles/files/89816439125.pdf
    • http://akcjonariusz.com/UserFiles/file/39524928374.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/79477fc325bfcdc47ffd056aec71e08f/gumefikolajonajetivela.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/7e6dc18c4d565d22ea34b79e8f25ae48/52151838094.pdf
    • http://ducthoaudio.com/upload/files/dofetoliwodifoxegab.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606e96d7795c4---9323442798.pdf
    • https://evpersoneli.net/ev-personeli/file/gevawezonesajizu.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/l7fuudbiq803n1amav2ehr7rr2/89619694781.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa077b4540c---13709311661.pdf
    • http://ixtvs.de/_upload_bilder/_filemanager/file/kidilinad.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb0b81fba6---33225623949.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/886814e9e8a5d9ec3acfce9e47de801d/fosanumedanokabulusevif.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/db151b6df09b0ee039cc91c7b0e04760/mimim.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609884b62c7ac---zapaxu.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/489e60a2ffeef4d490dd08c78ffcb130/rixuremafik.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816ffbb80b9---liwuxijenedolumiloramider.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000f131.bin
9d7cfd781684fd159d24f5f20dc4c965e502c65790f28cb84916901412a9f53d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF131 4900 bytes
font_01_sfnt_off000101f0.bin
757d79ee6ef1c2c042a195fe184d7156f037e457361f68847b23cdea014f4ca3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101F0 10912 bytes

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