Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe9ce4049db45b86…

MALICIOUS

PDF

76.6 KB Created: 2021-07-09 21:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0691b4e2a4d250459b2a24da58602367 SHA-1: 629c4c8f385bfc8a4c08a9ed16a4541575f010c5 SHA-256: fe9ce4049db45b865808bf7444376cedde216dcd9626af35e2d06b099428bcab
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. ClamAV detection and ML classification strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL analysis point to a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/1f0ed88fefe86ae3a3075d11ef9fc5ed/leremijulevugiporagida.pdf In PDF document text
    • https://mama-light.net/business_school/uploads/file/87797429088.pdfIn PDF document text
    • http://acquadiqualita.it/ckfinder/userfiles/files/rixafiwisuvewusite.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/61870193639.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/sipevumemarikuv.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/66897018998.pdfIn PDF document text
    • http://uci.ir/userfiles/file/kagibulokaraguvamusaka.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb28ae3152---rovimujizo.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/52844747524.pdfIn PDF document text
    • https://industriameccanica.it/file/kivotojekuzuvigovage.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/49ldme0pa48mts25hnhgpn5686/wixelagasisiwigukefatuwer.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/75430931282.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/8f217c7794f1215d8e8ab4e112ce2bcb/fejotoduri.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160df65357314c---pugumudunometapatukoxezi.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/207ba4e462f815a7e53b33d9a900074e/goxatarodajab.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075552f65618---39634915042.pdfIn PDF document text
    • http://btfa.tw/upload/files/94207008478.pdfIn PDF document text
    • http://demkapi.com/resimler/files/pafemami.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160794365afa4f---4041041393.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1291dc63e---nomikanozanewe.pdfIn PDF document text
    • https://davaocarrental.com/images/file/niwimojugalonuw.pdfIn PDF document text
    • http://inse.us/uploads/images//files/nodomumeveluda.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/mexuwatofow.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/99f8cd92dbe7b309d4d93749b791d3a6/4416077400.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bb9f58094---bofisuxuzekizitizeda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=2nd+grade+even+and+odd+worksheetsPDF 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_off0000c85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85C 17116 bytes
SHA-256: d3b9da08d39b2e26013ced6f512f454c8724da28463a5cd6a37c125273c5393d
font_01_sfnt_off0000f48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48E 10656 bytes
SHA-256: 097d7955e184d88df3b6d957cd192ac586a721b94d1cccb18b2f66bffb9e28a9
font_02_sfnt_off00010cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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