Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b41d7ee5c79e84b…

MALICIOUS

PDF

83.4 KB Created: 2021-09-14 17:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e490deeda7e4e108c50d566ddae103a6 SHA-1: 54c2732281c7d9cee9548e3d73409f57a31a6644 SHA-256: 4b41d7ee5c79e84b01610f4c62cc68b1de8d540aaa9f861b9ce3166b9b409c4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded links indicate a phishing or malware distribution lure, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/f23gg6ar4s33ouc0g4dp1enn0k/vexozinatabilojenexofif.pdf In PDF document text
    • https://kibledergisi.net/resimler/files/lemokogerefar.pdfIn PDF document text
    • http://chiuman-hk.com/images/file/73551166555.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/23486273267.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/lisali.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/lokokemexiloxiboza.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7a94dcc7e---15022461957.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/rd5h7l7h5d93ll0t1u5fep2e1g/67820962005.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/46825824881.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/tufuvobofar.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/dupewalo.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/55d2b736c33ab313e90ddfaa886fd2fc/getufagap.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/lafukapuzejopafekukota.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/levojanubigubapemapag.pdfIn PDF document text
    • http://aquatherm-graz.at/files/48183769803.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/wiwotu.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/kapewasidegedikatif.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/mugopagexeko.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/613c43966fb78.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/23391357794.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/e44f02d6fc61bb1285825fe47813d527/67325870414.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/vnegrff36a617n1glp0b8jv3ph/23855856584.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/585f6c87e491d2d46b13105c87b0a61d/83196948202.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/22758556690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=avatar+hd+movie+download+tamilPDF 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_off0000e437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE437 17120 bytes
SHA-256: f2c5055752bbdecad2fef575019fe3e2405d1a51cbfb52b341da812f4e16ea7f
font_01_sfnt_off00011088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11088 10480 bytes
SHA-256: 958a336d65f395bdb82537935793b3fe875bd1ac0960f84e140151d448da0eb3
font_02_sfnt_off0001282f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1