Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d1c58b1383cb751…

MALICIOUS

PDF

94.6 KB Created: 2021-09-21 03:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 25dbed6df4aa6841e111b893942030e5 SHA-1: 6911c53760965c8c1c350706d012ed5616d64ef3 SHA-256: 3d1c58b1383cb7514b63627d88599c20d2a525d4b0618f414c71f3ab744256bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous external URIs and is structured as a link farm, with many links pointing to compromised WordPress upload directories. The embedded URLs suggest an attempt to direct users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://chcial.ru/uplcv?utm_term=pokemon+adventure+red+chapter+free+download PDF link annotation
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/0a8881716863c94dce009cf5be342012/22666449305.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33636005094.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/10079266562.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/61228332983.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/32427970014.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/74997862074.pdfIn PDF document text
    • http://greenbelt.abwingsmd.com/uploads/files/97829210291.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109151756573048.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/nasagerifox.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///bavinupudenat.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/9050d576445e8aa1279db3be5f566c4b/27426905637.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/63291775367.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/413990021cdb1fc6134e46f3fbcb81f0/14501940691.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/xipemepinali.pdfIn PDF document text
    • http://abwessex.com/uploads/files/zenotudugefizotiz.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/soloxefubup.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161492838a087f---pegubovosu.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/91555752812.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/repivolojovapuxoropaza.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/58237444721.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/nekikerimivovogoju.pdfIn PDF document text
    • https://senegal4d.com/contents/files/42274849674.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/gomotodotepe.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc7e31e4e3---97433477726.pdfIn PDF document text
    • http://4bx.pl/public/file/xukofawamew.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE81 20820 bytes
SHA-256: aba39f396d413efa178931f223e43b4ce85843948a389caefa039690fd647226
font_01_sfnt_off00012497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12497 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CAE 10972 bytes
SHA-256: 88eed3aee05ef74282de10ffe4e7bf7679f82d4686668e6ec5a593fc5696f8d4
font_03_sfnt_off00015602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15602 16248 bytes
SHA-256: 6e704678c972a608e068b92e50dceb69fec53bba50bc54711a7b5fbfce63a171