Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9580b8b388dbeb…

MALICIOUS

PDF

85.6 KB Created: 2021-09-10 21:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e07ef9c713bfbc202c7f3937d17e7c31 SHA-1: 2b0dfdc745473d63d1fc637ffef589e55e8a29cb SHA-256: aa9580b8b388dbeb5b44a4513bc75f4f67b2b5ffaf5d9fb305cbff9e3df6de99
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with the 'Pdf.Phishing.Trojan' detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://synerhu.ru/uplcv?utm_term=android+auto+refresh+app PDF link annotation
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b5ffba5ff---jigonejunafoxaburuzix.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/zusewogevuwujukivev.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/21374335191.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/34084174665.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/64574894826.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/29116982030.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/a8a0e90a06eb0d098b70b115798e6c72/fekugopur.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/35225696268.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/51329232425.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/sqkv4gejud948elmgvmf5v3hek/87211818042.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/dubanodedojow.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/bidaf.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/41402904748.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/bijerijijabuvi.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/tozelirarodixerowuzoxa.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/redofog.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/3429025065.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/18180821080.pdfIn PDF document text
    • http://ux-school.ru/files/files/33079997124.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/1189396422.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/21199627775.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/12583990766.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/20980809906.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/zibuzejuladoxufagadukefi.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/tuvuvinu.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/metewu.pdfIn 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://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_off0000eb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB01 10632 bytes
SHA-256: 98643fa0c64fafed0ce03e3c2d404f331a1ec18b87b4d3ff2eafcaadef7cf119
font_01_sfnt_off0001034b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034B 17660 bytes
SHA-256: 076fb7fb7801d4864d7240a6bf66b055db830a931f5325352e2dab918fe68258
font_02_sfnt_off000130e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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