Malicious PDF — malware analysis report

Static analysis result for SHA-256 be7d8530482ae4cd…

MALICIOUS

PDF

98.5 KB Created: 2021-06-22 10:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7d3c3e41ed938363ddbf99de2bf1acb0 SHA-1: 61586fc04676d5e99822e7ca0a871eef302d3afc SHA-256: be7d8530482ae4cd86a7223d899dc846d90f21a39535ec4cbaae0136250b9c45
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs and link farm indicators suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution. The document's content and structure strongly indicate a malicious intent to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://oniceh.ru/uplcv?utm_term=diluting+buffer+effect+on+ph PDF link annotation
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/adf7c665aaa21c21e8a641ba2415fe3d/85293619506.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/vk5r6i54pu4inkqf8r8mkrp03j/suselifidenifowap.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d2d28aea5---14715348925.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/4su8r49oah7dlnhp78ggdaqc56/filogojarawa.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1609f32f6cf6e3---jozazijamidumekisarododu.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/27869760739.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/27d5e9bf7e33b66d02459d9961be9fa2/49033805498.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16207801651006.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b29c7ab9136---zovezumodefepom.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdce184c41---potararoduwudapafevazuba.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/7b154c265fb8099a9ccda4894091506a/nidigopilimapakejug.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/gazodibakovuwogozono.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/tepulilo.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/c1b49c5e6aaf1259b9115b4e1dfe6ee7/zijozugawixurexometoli.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ed8ebd3a9---zetodazapodonekas.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
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A19 5028 bytes
SHA-256: 19582712f5569be0e2b12c2f51414d061e8d86d0a34b6a28f9e0db554c8297ea
font_01_sfnt_off00013b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3C 12788 bytes
SHA-256: 7dbd3fa36b62fe7d4613b2af72d1db7a5384a98518dfbeba0b5fdefc84038dc3
font_02_sfnt_off00016659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16659 16260 bytes
SHA-256: 450bc3ee3c4d7902e5b3d1b0813c3168a27834aabb78753a0e826a7f448690de

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