Malicious PDF — malware analysis report

Static analysis result for SHA-256 29dc1eb0408233da…

MALICIOUS

PDF

93.9 KB Created: 2021-09-04 06:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5ecc7fb61e8932c672e65b508244e566 SHA-1: 581bd367bcc73b619f4320bf12104142d05e8078 SHA-256: 29dc1eb0408233da13dd64f286a7e660ced734d238cb57a7138c3a62de98d189
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The 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 compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, despite some being marked benign, are part of a larger pattern of redirection, likely to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/tabosaxopisilaxoza.pdf In PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/karovipapimanifopuxitupox.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076688ebb871---dibegafepewabezatabedobi.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/xopepazoripewusuramo.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/10534999863.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/fixosuguvadiresonutosomi.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083aaaf4eceb---669443058.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/fa2n2h9dton9m3okrr13h61kqu/88317601968.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/diwuzagajamarozolez.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/949eb6fbaf3b30f03ae092ab85ac5611/ratovep.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/sojifexar.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607523c84e936---14054191800.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a64c2a30cd6---44495069162.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fee73505ba503a10c879171531a109ac/73034979716.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/zasawemukanusekegane.pdfIn PDF document text
    • http://marketingnews.fr/images/file/25976617992.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/faregexuboxorefodafowul.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16097ffdf8b575---11954393586.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/konot.pdfIn PDF document text
    • https://bnovum.hu/downloads/konugimovi.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/r9fshsllp28mif9tiajb5sd4b6/17372545272.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/rufasanujuvumefigur.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/72452530009.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de7e1783e0---50145771527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=dsm+5+substance+use+disorder+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_off000107c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C7 18456 bytes
SHA-256: dfa45432fa2bfdeb747bba9a9a60185af92913906cd7016a86b6d708180e837f
font_01_sfnt_off0001386d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386D 11108 bytes
SHA-256: 3fa3740dbc803faac56c06d45356bdba69c5bb0d0f0ceaae6ba340286d18fc30
font_02_sfnt_off00015233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15233 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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