Malicious PDF — malware analysis report

Static analysis result for SHA-256 874c874d1726a614…

MALICIOUS

PDF

74.8 KB Created: 2021-09-06 20:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6bfd0c7456eb10b1026dc0f087ba62f8 SHA-1: acff8a1f9fda51a9836421e43166c428c381ea78 SHA-256: 874c874d1726a614d23d1876d7c70fa94025b83bfa7a685fbd7ecc8c22e60c93
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and the ML classifier assigned a high probability of maliciousness. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://baoholaodong24.com/userfiles/file/10873310877.pdf In PDF document text
    • http://parkhigh65.com/clients/4970/File/70966492256.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/70598769779.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/469e594a3e5b43321120cf491d3ae342/26953667703.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/menegizamopomuxubuli.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/gikebizofokala.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/40416489066.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/26114102895.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/14233881356.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/40095206011.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/67634592201.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/3a398dda91ad603009f662a546b960dd/lupepemexukobasopisol.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/53930427910.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609481c1e5c8d---xuginomowisejatilekafiwo.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/kodigini.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/1bc2bf92ef552ac33a74705e597d6e72/mobutebobobulatewugetomim.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e1d80cb1---21226692090.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843a4647591---51304514260.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/8c5aa18566caa01c5f1f3bf3b53e0109/31221023726.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/1ec27d597d3f3831aa93f6187ec4955c/47420341423.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/9a35c3977630b6f94fadd78bf22c4608/kulikozozovazutok.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/pmuh57jl8vbqg560ogenr5mv83/13663707409.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=la+roue+de+deming+management+pdfPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/vewajirotu.pdfIn PDF document text
    • 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_off0000bfdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDF 17720 bytes
SHA-256: 1bab1906edeee5c5d0c44de195ca90613c135d42692b314c6a681e011b7aecca
font_01_sfnt_off0000eb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A7 10684 bytes
SHA-256: 272d21633daa225df0f5b5a98e507dc422538ef4cad07b9701525db46855af60

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