Malicious PDF — malware analysis report

Static analysis result for SHA-256 186c3b5eb7e0c7a6…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 11:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 078b4fbb22f5c43f00bb1f5879ccc79e SHA-1: ef7fc456e2e390b58a84762ecd8864afc0ef3655 SHA-256: 186c3b5eb7e0c7a66501f0037000de085f1628a7b3d1460cb9a09deedb3c1764
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to obscure malicious destinations. The ML classifier strongly flagged this PDF as malicious, and the structure indicates it's intended to lure users to external sites, likely for further exploitation or phishing. No scripts were extracted, but the PDF's nature as a link farm is clear.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • 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://hangquangauto.com/files/4282695425.pdf In PDF document text
    • https://myshalewell.com/userfiles/file/66968366951.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/91161874957.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/41610541467.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/50634314471.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/mejekibus.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/xaleforeti.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210904/2109041531095462350iyh16w3fl8s.pdfIn PDF document text
    • http://lagrupacio.cat/file/10662789857.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/49479314827.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/dikagorimu.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/lizadimebogugopokusu.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/76323713641.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/pufugova.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/29778013431.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/wefovexevog.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/sabumolokumemosirovaxumaz.pdfIn PDF document text
    • http://ketex.com/trcgp/ckfinder/userfiles/files/jelatoxuzevub.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c5c4746e4---1373797976.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161417871578d3---mawefitotexogadibigopop.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/gojofabefid.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/8d9d6745e041023239934363d02e3556/80837755337.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/59333584552.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/pozid.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/29139389684.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e4d57ef2a---nuzowug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=young+and+dangerous+2+full+movie+online+english+subtitlesPDF 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_off0000e1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FF 11208 bytes
SHA-256: 0fa59a765c9122eb1b15910eb233aabcb4faf74700b26cd5f46b6b014068aa9c
font_02_sfnt_off000113ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EA 16664 bytes
SHA-256: 6df1bcd679446205e7bacef119a0e260de7e699197a5814974bbdb02c89f4c1c

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