Malicious PDF — malware analysis report

Static analysis result for SHA-256 58df217921821840…

MALICIOUS

PDF

74.5 KB Created: 2021-08-06 20:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 34d7e6a19bfa9332c1ad9f30e05ecec9 SHA-1: dc220f34dee1de45e6e9556e29ee070bea7de84b SHA-256: 58df217921821840d7dd9efbc788b5016353e27172f776d34b8041ccf36e5afd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as Pdf.Phishing.Trojan. The file contains a large number of embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to distribute phishing content or malware. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://medvor.ru/uplcv?utm_term=partitura+concierto+de+aranjuez+violin+pdf PDF link annotation
    • http://cafesezony.ru/fck_editor_files/files/muwudotatikufu.pdfIn PDF document text
    • http://12shio5.com/contents//files/44426561080.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/kepananiremulomesufom.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/33445735634.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3fb4e76f5---38831329826.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41191131470.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/10143370976.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cce5b11a4ee---bopef.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d734649365---ginukasumobanavo.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/49495346119.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/34712297995.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xotitonozepofikomi.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/1bd6c029089822e45655e02799bc3ecf/52526228802.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/58667153639.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/6242633483.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f09bd6be8---fipubax.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/ropiropuvi.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160935dec9609c---biriziwepevikupaweg.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/zototodejuw.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/dedewazifeloxurak.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb890a0bfc---rovovopudin.pdfIn PDF document text
    • https://curryleafharleysvillepa.com/hang/userfiles/files/98640361424.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_off0000bfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC3 10800 bytes
SHA-256: e90b665855347a40d726fab696d60e3c8e6e6e251d8f4cfc90d20ccb5bb09669
font_01_sfnt_off0000d8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CB 17280 bytes
SHA-256: e715489bd18af5bb6c326b79db87af2f6f3e7526c427b6880a63a99596b9b2a0
font_02_sfnt_off00010404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10404 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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