Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfec83a48a8b2f11…

MALICIOUS

PDF

73.1 KB Created: 2021-08-22 07:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1cc661468cfdb81aba953a14c6252649 SHA-1: 8d471441244df1e742e0ab55928f1b76a2a1dd35 SHA-256: bfec83a48a8b2f11058f4028b1f091d3602ab24451438b7737a4a146391de80a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the nature of the heuristic firings point towards an attempt to exploit users by directing them to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/8abff4d65da768a32b94d16fa95f4c8a/70037260706.pdf In PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874683817af---3955049114.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/m4aorakq46c4el7si5edjtdv3r/65849872430.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/gamolaxubu.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac37ae4c5dd---gozoliwowawopevipibaden.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/39828225269.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/22335356448.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210603014642.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/63c2fde42aabef21f1009a62f98dedca/lotiz.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/74412935844.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/15140334422.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/9283365920.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/sudefobevilusel.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/f62f2feced6b282891ee1d51cb3f7e24/67000034615.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/bedivupinalumimadobo.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/735irkk0fv71l8m6juh2lel1av/sijoxatu.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751cfb114c8---60139588800.pdfIn PDF document text
    • http://canvangdientu.com/images/file/92892266712.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085996319359---51301935475.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/vafikaxitiwomorumozowow.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102b980da983---10531199646.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/46773159325.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/wawazelabinoruk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=comparative+adjectives+multiple+choice+test+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_off0000b99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB99B 15996 bytes
SHA-256: 454f249faea0f68bdbb4b5a604e31fe17a457504c1b92a5a25909f063f934ded
font_01_sfnt_off0000e2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EC 11108 bytes
SHA-256: 87bbf213d619a723c6612611928805b138a97bfed266509e6cce0a84a0a22740
font_02_sfnt_off0000fcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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