Malicious PDF — malware analysis report

Static analysis result for SHA-256 58de5bbed71d4606…

MALICIOUS

PDF

112.6 KB Created: 2021-07-25 19:26:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 88b4dada022aff8b14049cfc989686ae SHA-1: 116598264c140071a45540367b089ee42fa40268 SHA-256: 58de5bbed71d46064edf8327c09f3e0a718cf8da5d675d1f9a939a79ecff1f02
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The file's structure suggests it's designed to host a collection of redirect links rather than display direct content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/690647cf75ce7fd67bde12c1bfc5ba50/bijetemisoxunubu.pdf In PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d01de4241e6---mupigapes.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/inqbirks6c7vb5f2i03fss12j5/wolijufadutusukagamujem.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607104042ab7e---rimibedakuwirobotufid.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/24383306009.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/jivakas.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/56054606834.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608350b5f2ca5---lawirovaxotebu.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b04c9ef1349---patafifopujebebujotutusu.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/g5plomb34gib1m4arnauvha5ua/jusibudixez.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/796fd1ea48d6a0b26dfdc3d8dcbf3a0d/gemibezadegegamevison.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/loxibokixujuzuwaj.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/9395809793.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7d931e05d2c9ee1f6d7cfbe9c39ded14/dirulelaloxujilemaliboten.pdfIn PDF document text
    • https://avvocatoboretti.it/file/nomozamijimobufojiw.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd4211d2ad2---55030780703.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/362159fff933f874ddbe7a578886bb82/94783778449.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a330b712c6e---xixepumuranuzesopowiwara.pdfIn PDF document text
    • http://grafordexstudents.com/clients/0/05/05b3dbe7dd9dc6f92b523d2b721f2ffd/File/xojisagofufenupu.pdfIn PDF document text
    • http://bowlinggreenhsclassof66.com/clients/b/bd/bdf8ab256cd88a603fc2b95a051c5839/File/72787082619.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/32c7a8133217cb501517bea40c07e9de/92562665624.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077cbe6ec08a---91043058692.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=mash+cast+moviePDF 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_off0001567b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1567B 10304 bytes
SHA-256: 2b8ad4a06d10325b2b6bf98ef0cc80bcdc189bcbdc356c89519c87a5598a1a08
font_01_sfnt_off00016dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000185dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185DD 17012 bytes
SHA-256: 445c2b2b7de3bbe87ea6b5c134a05733356d77e883eefc8f93732fda320743aa

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