Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dadc5b171d22024…

MALICIOUS

PDF

83.9 KB Created: 2021-09-03 10:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 21d6f47952f7902c4aa9c61e8aaf79d9 SHA-1: 82b0573dcd51a06038e67273eb6a909d43d8aa7e SHA-256: 8dadc5b171d220240bb7f71d65dfe6aecd566b7e88379ffcba0b4bd378a1c611
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/ca59af5fbbff56fe8b73c441eaebf58b/bibumukitixopufusakubul.pdf In PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd10951da2---pefularojutuxulotoxiximis.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/69117487759.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/jikafuxidi.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78129cd926---fudubigozamuworififi.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/tobaxax.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160992567a097d---2094063738.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160ba645c00390---rovuxomalivojewonoxoxu.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/taftsa2o2pcj9cm4jkptjrcvv2/sekukugimaxododakidubaso.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/rozaxidamagafagezofonut.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/subunedomovovafotubowexu.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/tadetuwe.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/telogepibilusapudarulavuv.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/xofilogojixofixuloke.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16dd74e7d8---zutukiveganafid.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bdd07da822---14950926531.pdfIn PDF document text
    • http://taociren.com/upload/file/210722025413922501n4jg8i8xf6t1.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/3j5uhjjud8o94ehb51qdjq0r86/69753954381.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b1189a7be0---bigabuwabebovinokakugi.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/44368584632.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/ab1974os3g68o17op4m88rmqgu/60803628964.pdfIn PDF document text
    • http://shs67classreunion.com/clients/b/bf/bf9552935413f2527bbee995f2dfc9b5/File/61821400899.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/kodipirigeserabawaxelo.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b85f0863b6a5f05d1a5c90e0808374d1/kuwovitafonuxozusexi.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/39946357204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=figurative+and+literal+worksheetPDF 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_off0000e272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE272 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA89 10848 bytes
SHA-256: d53011a69c1a96b664668e07873cc21f84ff8a5c0b8f801211913ec556808890
font_02_sfnt_off0001135e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135E 17792 bytes
SHA-256: f1cd68b10dda494dfcdc6d3d89591c262169449ad0def7968d1febe4c8e7de6d