Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d15b59f26dc4e9…

MALICIOUS

PDF

84.6 KB Created: 2021-07-13 21:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2ea4342bea7d3665b0c7073faf02577c SHA-1: abf57e9d455aedbdd32efb594f48fcd8b962b9f9 SHA-256: 11d15b59f26dc4e91958d7e537c248118dd50cad92b2ef345a3ec6e25067b7c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs that form a link farm, likely intended to redirect users to malicious content or phishing sites. The presence of these links and the overall detection by security tools strongly suggest a malicious intent to lure users into compromised environments.

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://coretry.ru/uplcv?utm_term=how+to+know+if+the+equation+is+function+or+not PDF link annotation
    • http://phanphoiongnhuahoasen.vn/upload/files/52397731721.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/5862c5e9f460a71d43bb0b2434769929/73477037056.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/5bf9d714c4fd6e7a7aea9fca8bff5b07/rugoku.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/22790109749.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/5bd4e8f0317eb6fbd2597e1c9963f20e/meletorekez.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/91311094290.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/02befd59c6680c6e5e6963d9c4025e4d/tigodavog.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/82676823574.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/96424763052.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a539ef606a0---gugatesadasinuk.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/govelatevamawuwiriz.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/90842791133.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/binevofekuterabepusonu.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/wuxewagidejoxowo.pdfIn PDF document text
    • https://mfdesign.hu/files/file/54382985502.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a255a17d4---nuratewevujosure.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/he80nvs7lc5rc2ga1vo0kmrq31/zufijabitoruxuxilize.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/57255181400.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/79a7cbeb06d62b38f27feac5e4dde2fb/81634601827.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/bcf84cb7558006194a5f344416210462/gedepijirujijow.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/gowajoparorugememen.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/v6bc2a60632edhcus3ukujo41d/80757014061.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/sawarojunalegejuduzonov.pdfIn PDF document text
    • http://chichen.asia/ckfinder/userfiles/files/72148177194.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/k584eve4658b6iavqe9ka22icl/36122640447.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1627b212fd---xigidife.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_off0000e734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE734 10804 bytes
SHA-256: 7e26a9088186bb055fff75f5f6a8234b91cdad9f40f65052a161a34d4e0d3c05
font_01_sfnt_off0001001a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001A 17072 bytes
SHA-256: 5969fcdd62c7e5848dfaae1d62816a97fc44a32f64d8ccfb293250b0fb21b85c
font_02_sfnt_off00012cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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