Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ae2e4baa427351…

MALICIOUS

PDF

86.6 KB Created: 2021-09-06 20:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f9a8adb01ca465356356accc7668b243 SHA-1: c764dc7f474200938c6852d440ccce729ab6b4c0 SHA-256: 87ae2e4baa4273513f87be7bd0a9085f1f2eca25ec1e69783e04f830818cecde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to numerous external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious content.

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://smidgel.ru/uplcv?utm_term=thunderstruck+spartito+piano+pdf PDF link annotation
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/92547078011.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210606173221897579113.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/xapopuz.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/c2u0bj4r52jt210vvlg8egr4p9/kudutuxaxigowevitivom.pdfIn PDF document text
    • http://belv.ru/userfiles/file/90507776384.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356089890e0---nadoriwaferaxufosusel.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/vinubabitoxobixubegitoju.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/48472073965.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/23708327458.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/43505189471.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ed4b51eb0---79987066514.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/62922452851.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b018b93322a---24810987379.pdfIn PDF document text
    • http://santehnika34.ru/images/file/64722562296.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/sqtcgbl5ciprqb9pmr7hv2fbf3/90168724106.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/m9h3l6ff73u0e86evm6qufkbla/79473725770.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1d684120c---jizepobupitezasola.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/gikofubiwuk.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d272af89c---ronegofej.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210718_82A69C314A1477E3.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/gosizoxik.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ee2eac99abd53fb168c66b8d8cfe96d4/napobowatozibufiwalirok.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_off0000e818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE818 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001002f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002F 10828 bytes
SHA-256: c4d5ea273b40d9822b1aedc61a601aae0cd102b4e0dd501edbccda533373e011
font_02_sfnt_off00011919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11919 19884 bytes
SHA-256: 4504c008aa81206685e546e9c286c2d85fbb5db6251a7531558153cc3b9e3f41

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