Malicious PDF — malware analysis report

Static analysis result for SHA-256 c47b3effeb5695ab…

MALICIOUS

PDF

72.4 KB Created: 2021-09-05 09:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: de5907d31632848e182863492878aec9 SHA-1: 99b592d59fb2736c129ca618fd7a67c14626002e SHA-256: c47b3effeb5695abbb97864e6491c9fe6093bfd2a61d1647a989872424a7034e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the 'link farm' heuristic strongly suggest the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=getting+started+with+react+vr+pdf PDF link annotation
    • http://abimobiliare.pl/pliki/File/geguzowuwewefuzusis.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/rofoliguripoxewin.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/87161341085.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/vuroza.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/13993720540.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/wiruta.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/98682312507.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/17475757061.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e59853606---fijososenegegupanef.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/286f94b670004c1710ad9fe11534bdab/gipojujudemefaxoropes.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/f90902be21058f92a877f7816e8ad559/zutasofejitudofimoz.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/mapavuwugad.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/28c9c023945a9aaecaf2dfbbd7c749fe/92457376813.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/fosafiki.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610b55d352694---zitafikizitilozedakesaxe.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/fametogojowozitixogitidef.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/eada97f4a725719491650d19038b4edb/95680419546.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073ef9977033---rarapobawelug.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/9eadf3de041735b8bf53ab7938f10ffa/24924525011.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/b70220746ed2661cb1e9fa3cac0aed9f/54060437544.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/lodelejojiwi.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cecc92bf5---miwixipupikarimofunazenok.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/ravajogubaromiz.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/nenezumunoxib.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/qsa7s0etq63bvlhtojdack3cc2/ruxup.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_off0000ba1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA1F 10924 bytes
SHA-256: d3cd4ce5ceb9991332165adebbb1986b8ef5f69ca7092074e86fb47f39228d63
font_01_sfnt_off0000d344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD344 16096 bytes
SHA-256: 0892816471bbb0b92222c4dc40dea37fefc416ef744bf64253edb9c22e9327c2
font_02_sfnt_off0000fc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1