Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee5804a85b957195…

MALICIOUS

PDF

90.8 KB Created: 2021-09-03 17:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 325617aae8d05ef79293e227c33748e4 SHA-1: 2597e0217270bdc0df0548acf7f3ce939038b854 SHA-256: ee5804a85b957195d88d934dd5dd6eb530bf7a0190c7dc042a775c95a08a869e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external files, many hosted on compromised CMS uploads or disposable domains, indicating a link farm for SEO manipulation or malware distribution. ClamAV detected this file as Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0, and an ML classifier also flagged it as malicious. No scripts were extracted, but the structure suggests it's designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://mywayrtk.info/userfiles/file/xapudeg.pdf In PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/lofijipikiruse.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/bifotij.pdfIn PDF document text
    • http://wuchem.com/upload/files/48771814130.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/39583254330.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/fotixarelu.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16109dd34910cb---68269609034.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/6fa0653521351f994667623af9035faf/gifamilikuwekewopapokoza.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/zuxojof.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1611db6c994b53---98840900052.pdfIn PDF document text
    • http://fainitelecommunication.com/public/editorfiles/file/dijixi.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/93496826117.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/boguxozelemub.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/1483376642.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/63113525609.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/l1u46jjdm8ts8661gv0r2qc855/xuputakamimadafokikes.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16117409b72cf1---novaxotobiro.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608618318b286---22341418538.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/42015745452.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/xogasojusevipo.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ccdcbb5e5---45638112049.pdfIn PDF document text
    • https://angkalaris.com/contents/files/14481334253.pdfIn PDF document text
    • http://airfa.it/userfiles/file/88166377622.pdfIn PDF document text
    • http://juicewarenhuis.nl/app/webroot/files/userfiles/files/zuvex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=area+of+non+right+angled+triangle+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_off0000f523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF523 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D35 20488 bytes
SHA-256: 4f6a30d8879f96b97ec6223f634521a9fc9840d2474452237f5ea1f14e22c07b
font_02_sfnt_off000142ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142EF 10792 bytes
SHA-256: b1dead023cacf90926a77d9cc5d7a9382fcc747e79ef8fce7ad5b53420897211

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