Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c5b14d93b2b493…

MALICIOUS

PDF

88.9 KB Created: 2021-07-05 07:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8c3482e51202de04ebb1fa792848fcea SHA-1: ab59b44c88d65756effc0b6657f1eda844b14a16 SHA-256: a5c5b14d93b2b493b0b7ebafb20b729c2e2cd4ef418eb2ee9cf6a49b2ffd6ecf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/51308458090.pdf In PDF document text
    • http://meyanko.com/userfiles/file///65074380196.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/95774478918.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/49a94f2a0df38d7efe5f400931a9e4cd/41585824654.pdfIn PDF document text
    • http://humanlitech.com/files/files/gobiwum.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/78714fa28f4e78f6f33b66f60141e6ae/52492400627.pdfIn PDF document text
    • https://appfacile.it/file/43107830172.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/dumomov.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/19229fe024afccdd2418153ad07f400e/44598598142.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/81487875373.pdfIn PDF document text
    • http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/buzajaw.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/vuzekimumeto.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/gamatidikip.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160788089dd6e6---43002444298.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/lororonadusewexegig.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/pate846gdudgobl3khe5j8n6s4/20793386888.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/3ebbb96feab4af9e5413c2ded1acecaa/44426693277.pdfIn PDF document text
    • https://premium-house.uz/images/file/18952564141.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f56cb6d6f9---vanavoji.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608307682d95f---nasekufi.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/86017467682.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/mitogeviwazosafuguze.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/vuzisifepas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=kylie+jenner+before+and+after+plastic+surgeryPDF 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_off0000f272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF272 18152 bytes
SHA-256: 65fda616da2c1beeda192b732ee5d13edb4a26672b1c9c645ea14ff16fb941a4
font_01_sfnt_off0001225d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A74 11268 bytes
SHA-256: ddd456c7f27acccaa87f7f11e5c035258c2545ff55e6513a549355ee3350e005

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