Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ec0a834a1035c1e…

MALICIOUS

PDF

70.9 KB Created: 2021-09-06 13:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: f1f1d4d633d10a27e53919eb9bed2496 SHA-1: fe06baa5174cb525cd12e92e57cc46f471353889 SHA-256: 9ec0a834a1035c1e1ebf4de97c37faead0b0d8dd19018c881153e446d3ceaf8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/kljruqgod81ilosv351bhbhshb/3897176690.pdf In PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/o76briu6cg9v0gg2h8u4ars5qk/77229942400.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/xajuwubu.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/40850849011.pdfIn PDF document text
    • https://ms01bet.net/contents/files/dedobezadiviwiwofajinedu.pdfIn PDF document text
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/xuvexugib.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798477e4093---pekusujetidomelelos.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/939ddb61d43bda3a2eea5796fa822c43/65160817214.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160adb658e5877---95430267216.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/nemovasoz.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/lusawamawaxunuj.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/44119247732.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/0c6c188199a1b5211b6673b6bb0aa92b/kemunapowegiwosutesilup.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/14693139687.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943cc564e32---16787335313.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/fokubafubojaxedepop.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/mexusa.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e7fe36bd---penipusikefagofe.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160b7661c6b1d8---gujikotefidefikuz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca30de9881---72883006163.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c778998210---21462781435.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/3dtp176kjv3hadjfd7qvrsmbl4/18834683925.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/46838577142.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/hmeb8mpi7neq19g569d6ftphcf/bitefidizalobitikaje.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916ffca0eb2---resajer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=definition+of+diabetic+nephropathy+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_off0000b94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB94C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15E 14428 bytes
SHA-256: 6eb10a5d238f8a7ca702e2cd9963d033506b6e275b5c636d77910c297ff72ee9
font_02_sfnt_off0000f526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF526 10756 bytes
SHA-256: d872a0ad36495f21bd1badafb61955194818cf8802580798f6e0a33987377216