Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbdef47803862695…

MALICIOUS

PDF

82.0 KB Created: 2021-10-14 08:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 13ae7f9e2366cf9fde5e1aba8a96b9eb SHA-1: 0a3e3a1186c1adb25edaad1735561ba23c008cd7 SHA-256: fbdef4780386269524e46e2899b173801c4af166dd7a0ac43c8065fa0643affb
164 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, suggesting a link farm designed to host malicious files. The presence of a visual download button further supports the lure of downloading a payload. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6b43337f1---xalukakeze.pdf In PDF document text
    • https://capecoralliving.com/media/file/waperisereniv.pdfIn PDF document text
    • http://precisao.org/files/files/66887889800.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/sikowabalugutanizulovu.pdfIn PDF document text
    • https://vinaskitchen.com/nbloom/fckuploads/file/goxojin.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161621016c8acc---demaxazawika.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/a968a754e07c62bfe4c96453794f456d/defokigebenexitisijaxire.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/52304659403.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/domoduvumoxuvig.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/kelerelenolukumer.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/161304fe32bd6b---78923369681.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/nopolimexufow.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/76603540930.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/48425225024.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16166972227d5b---zewovavafefavesuxitilib.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/5d95a97fb8944df5ed39408731913d46/5455656057.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/58553334240.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/68936421424.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/dugalepido.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109270452151891.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/fikawuxunomodixajexidofij.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/fetogoxe.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/litujofatefuf.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/busewitonoziwixuz.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1615885eaab880---jenoliwal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/TxADE9PCSUw/uplcv?utm_term=clash+royale+unlimited+gems+and+coins+generatorPDF 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_off0000da1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1C 17824 bytes
SHA-256: 9f267f0901b5e4cff5778585fd235b17d11dc1e7765097d336e3ae5fc83004aa
font_01_sfnt_off00010879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10879 11060 bytes
SHA-256: 5266d7ba121b5a4f55010c71b4cd14181f0c87b6f74075242cfc1500c7736747
font_02_sfnt_off000121dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1