Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5c5b5ab9481553b…

MALICIOUS

PDF

82.9 KB Created: 2021-08-16 09:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5563d3f5cb1fce16792d3d4a72084b25 SHA-1: b323a5376a06ee78dad18236e1092e71f91dfce7 SHA-256: e5c5b5ab9481553bdf974b4cf3c6553a5e2c2b56434016fc7d46acfa98ea9fa8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/govitebovogutaguvuwi.pdf In PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0560af0cd---42220493317.pdfIn PDF document text
    • http://cecev.com/stockages/files/ginoxa.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/0f4ajc81eua1oijgsqsdfiu86s/77664881161.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/1c89b171d0741429f3a08edb43dbd05a/dubegisugowovo.pdfIn PDF document text
    • https://asiajitu.com/contents//files/wavoderubikisigokuxogilew.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/562cd4f472746593b156027266637d70/fozeperarifawamusume.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/f27f4a5e8d9cc9290adbd31b5090aa05/97627047431.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/kovusonaseval.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8834a43c1d---94769851059.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d5c5636f4c6155a6466679b13977c46c/gefutugezaxurutoselimiz.pdfIn PDF document text
    • https://rosycaffe.com/file/parilixopen.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/69054140913.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/25822267716.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f9daab31---nadagunizitozefaf.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/ae42b0525d7de673be9ff4d8e2d8a462/31979346121.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/84528104143.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/gopuzipexaredolejasojaz.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082400c9287c---11992559810.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/pavewawelexipegevewosimom.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/42114889235.pdfIn PDF document text
    • http://podushka.by/files/files/13278355519.pdfIn PDF document text
    • http://sjhtractor.com/d/files/52683185004.pdfIn PDF document text
    • http://clifestyle.net/uploades/userfiles/file/69064374573.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/726819d0c347b1e6528b2958e0f2d42b/sujepekusalivoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=cuanto+es+150+gramos+de+avena+en+tazasPDF 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_off0000db08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31F 11016 bytes
SHA-256: 7a71ae8369b08f657e5435cfeaea57bded8364eb1fef314ea3fd8e377fc006a4
font_02_sfnt_off00010cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBA 17996 bytes
SHA-256: d0717d4d2db5145caa225d4ea2a6cb4a8f8e184948e6168c1edda49ad9e6aa30