Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d952f8617ca2b32…

MALICIOUS

PDF

86.5 KB Created: 2021-09-04 10:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 316bd9d9bd9146ebe7f4b3a294fdfa3e SHA-1: 3f01ed310bd8ae292c6cc2dfaf45e698f9663d52 SHA-256: 6d952f8617ca2b321f7613c7858f934506d8bb115d656a9c28b74d4ccb876317
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or utilize disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://assessmentinsight.com/ckfinder/userfiles/files/60138937446.pdf In PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/94621845407.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/44453352667.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161057998bfa6c---metusufojugumuraf.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/6df5b6fa37384d0735cbd260d09fdd1f/69284842804.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770082bc166---63334544812.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/bca6bf78c6f4019f12e82f6de6800d8b/32651259517.pdfIn PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/1656867119.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/95187138129.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/64987763577.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/64855158862.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9bf62c71f---savibox.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/68627493986.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/53600606140.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/kuginukewigasotosixan.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/5262535517.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/12648392704.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/hf2kv08gblt6mnrrv55i0jnueo/61724506244.pdfIn PDF document text
    • http://metapolar.hu/tmp/kobubegema.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/serobedawapuvuli.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c31febe59c4---nakupadebuse.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1a2a6eeb2---27473044903.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/56835736249.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/kubusamubokaxininipubi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=present+and+past+tenses+exercises+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/6833917b3454d0e3849783bce51472cc/kofosisa.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_off0000ea04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA04 19048 bytes
SHA-256: 04dd53754e33b3dfaf93d22d5522ddb7c356fa525e8b782cd860c4c715852863
font_01_sfnt_off00011b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B81 10548 bytes
SHA-256: 4d2758bc5e47677de21b729c913fb3a13d5ac55a94f7d892ea2d252757f7118f
font_02_sfnt_off000133b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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