Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b87bd43668a36b1…

MALICIOUS

PDF

84.1 KB Created: 2021-09-02 20:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b8f7b0c1da857e8077a52d2b10462fa6 SHA-1: 3d7ae65df0364f54688e27320b1f2acb1700a264 SHA-256: 2b87bd43668a36b1ddafcd4d553347d82c80822a970626f1b21ca6bd14b9e130
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and disposable hosting sites. The primary goal appears to be directing users to malicious content or phishing pages, leveraging SEO techniques to obscure the true nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://yngc.ru/admin/ckfinder/userfiles/files/tidutedokiximawefaneke.pdf In PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160afd44dcd94b---roxak.pdfIn PDF document text
    • http://fpole.ru/sadm_files/37184091532.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/23cp31i0t9ql0sjt42trgana9j/votodaxujiwodifonewu.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/400d2fe345b4483f850004f1631f01de/jevetuxisupozuweluru.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fe5b7d9a1---35887108292.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609201a442be8---16494702506.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c89212e8a---89885873646.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/pumowerodasofip.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/rigumuwavofasobuxexe.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b40b93a1---vopivobovofotuj.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/devuxakojixefemewosijo.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/44742404520.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/weraru.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa6dddd2fa---zalapiwav.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/80975334041.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/20649460567.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ce99a939d---91331141238.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/66ffd92d2b42d9f1c0bfe0b4d8124e5e/vajadejisasirebotezajipa.pdfIn PDF document text
    • http://benrassam.com/uploads/files/lelararekozefudorabega.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/96527405124.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/p5mf2uf4bi1drv4aevk348dj07/76065280078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=thyroid+gland+disease+pdfPDF 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_off0000e63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63B 17168 bytes
SHA-256: b0958070be528c02cf9299e18eac08641e1e56844293dd9556189f7ececbf6ed
font_01_sfnt_off0001127a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127A 10756 bytes
SHA-256: 41425ccc3f4498344299e01ebd4d5be74e967142a0bca130386c62e0e8d7cf9f
font_02_sfnt_off00012ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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