Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebbe33c7174f4504…

MALICIOUS

PDF

73.2 KB Created: 2021-09-06 15:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4b2d10a573577143f344bfd303b12f2d SHA-1: a1d026ca8bcb7dbef3b8fd3d83c3b4264a2592b3 SHA-256: ebbe33c7174f45046e5fd68627c6e021b9896cc21f5db89c6954723b318a285b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://telmeed.com/web/ckfinder/userfiles/files/nososazunaw.pdf In PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/pj5idaqqfrd28am7v9h9ja8be1/45523021309.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1993a6a8c---rigusujokukikaroxopudefi.pdfIn PDF document text
    • http://suacuacuonthanhhoa.com/upload/files/xadow.pdfIn PDF document text
    • https://www.shinoda-usa.com/ckfinder/userfiles/files/levelawagarem.pdfIn PDF document text
    • http://funperm.ru/content/file/81730970706.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/38787329680.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/rujituketojesidemur.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/ruwimafupofelixeberaxaxi.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/48519902486.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/wopegijarupor.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/ramasifozago.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/lajunapomanivubuzizef.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/85957277019.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609acb5c0bf78---bariremobojezewuv.pdfIn PDF document text
    • https://starwebline.com/calisma2/files/uploads/wazomipunitiwijija.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612b9abcb677d---4945879764.pdfIn PDF document text
    • https://hssanesteban.cl/files/joluvisijedi.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/f9517576bd12a252d70e0f117b608cce/wifojulawojetinalobari.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/93712070402.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/xadagisadu.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/16218374891.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd390692df---valigulaninimudu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=modal+class+worksheetPDF 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_off0000baed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAED 17348 bytes
SHA-256: 25ef09f11acd105501a379007ff42c8401415b7109e12b643c4877dd3dfd03bd
font_01_sfnt_off0000e7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF4 10440 bytes
SHA-256: efcfa0e9699be7f59dc9e74f2ecc34ad0cdb7405446d3ef17b8a3ed36a27e24f

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