Malicious PDF — malware analysis report

Static analysis result for SHA-256 63d0689f9ba2d807…

MALICIOUS

PDF

78.5 KB Created: 2021-09-04 17:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9f2a711d4042f3637cf2e8a1688d0360 SHA-1: b86d6276b3ce5720ff86ec65f04ec81c9f1b0dfe SHA-256: 63d0689f9ba2d80709dd3115df26cec4dbb4296069bb203c313ab0885ce21f31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting domains. The primary purpose appears to be directing users to external, potentially malicious sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/041ngtg03bd275i40gr2e4rtb2/bakotumezexaxurukuvu.pdf In PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/fibenikoxed.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/xizuragoretajanorere.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/68543153387.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/a7c322b8f58c3c8bfa270ed6209a493f/sekozopupotojeponudomi.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/luvimu.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d92cf6fcd4---suzazupan.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/zobevutenunud.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8cb62405c---texajamo.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/14808720523.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/wiguropivifefajet.pdfIn PDF document text
    • https://actor-conseil.com/files/file/10167747286.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/rajoxubavaki.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc7a89075f---45183256973.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/wumokadotug.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/figikat.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/visokusizudekigenalagiro.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d776e4a1b---muwuf.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/5a5adb60ed00db3f778da1e26ef541bc/85826061300.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050217451273499.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/82019979949.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=mettler+toledo+ph+meter+user+manualPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD113 10660 bytes
SHA-256: 3a25abec972cb8d00e626288535f7e6f46f65929b7072a08d732e4cd250bb286
font_01_sfnt_off0000e94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94C 16604 bytes
SHA-256: 7635e99cb4ea1a0abb94839bad83217e7ad97cfeff896eeb7d3a40b1ffdc4587
font_02_sfnt_off0001146b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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