Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a641e5f84df775…

MALICIOUS

PDF

84.5 KB Created: 2021-07-26 15:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6603c74aec61f71448348f86bd21f6b5 SHA-1: 8f131bb6ccc9067d626a48dd55d5b478cdd40b19 SHA-256: 04a641e5f84df77531e3a3258a2d965fba3dccbcef8e8a4f949771366c507820
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to numerous potentially compromised websites, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d46d5825786---pedewopa.pdf In PDF document text
    • http://alituncer.com/userfiles/file/38797145626.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210621160201033908y5fuyrzmu6jv.pdfIn PDF document text
    • http://castel.lu/userfiles/files/pogapolasepijovi.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb8a9b3504---68165445236.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/83929541822.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/bb601685dd5806898aaf2dfb56f3d5dd/xefigalozuk.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/dajezenek.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/piwadifajinapo.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d7af0102da8---gadijulalolidakagumufona.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/85070770506.pdfIn PDF document text
    • http://kalikraft.com/images/file/napov.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/8ee8d5799fa8511f19a2e689fa33750c/luzojoxufukibujamegojakuz.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160da1b3e3ccf3---labekajero.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/37c6far2f6m5edbqop67kbrhcr/ketegudukarabuxerixima.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/gitoxaxabamalidexoposaz.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e94333a2d22---lovezufowo.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/96233498240.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071970c78b4a---3528030958.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607a0d0e63dfc---4185429059.pdfIn PDF document text
    • http://autovoda.ru/upload/files/zoxoredevob.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/pexotobulojidafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+trade+indices+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_off0000e8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F1 16648 bytes
SHA-256: 016ca566946355b1e39e11cf04eb8cdcf9fb8a8effcd5dfebd33f41190c04bae
font_01_sfnt_off0001145e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145E 10644 bytes
SHA-256: c47f4846648e938804c8f23bab7f939a2ec12e7e619f4a91846adae1852d1ece
font_02_sfnt_off00012ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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