Malicious PDF — malware analysis report

Static analysis result for SHA-256 1751151950ec9556…

MALICIOUS

PDF

95.2 KB Created: 2021-09-04 11:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e69672b74b0e8296acafb3ff7fa66e15 SHA-1: 357f373c14912a8a0963e54744e8578135a18b40 SHA-256: 1751151950ec95566d42657c3f34c1d1e9eada4a18b4311a2018929ca05b3c47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The document body is heavily obfuscated and does not provide clear textual lures, but the heuristic firings and URL analysis confirm the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/fbdf45f767f116465b55e3c5abfbf18d/zusevilakogatob.pdf In PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1608645537f89e---toxegalagegenepolux.pdfIn PDF document text
    • http://derma-dts.de/files/file/36740452424.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/78305270905.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ffb9b3f35d8---narexuwe.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1ac27e04b---rajosopoxogulasuvudefisu.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/lepogofikipaberave.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/fuginetafosojufiniguta.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160857e6673ece---nipetewedukijare.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/93747632544.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/7369633547.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/47030045998.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774345f0c20---terivopemaxezez.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16073a27263848---farazulimidez.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/k5chg7f2uu727pugcdmb55ese2/tamafululixujoxir.pdfIn PDF document text
    • http://vitrine-prof.com/files/tasuwujujoroma.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abffc7c4283---96883748454.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-7-27/20210727160003991996.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/nizoworavupojekedowos.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e7cbc897a---fijafufeluf.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a905cef3a3e---dosekexi.pdfIn PDF document text
    • http://adice-area.com/pictures/files/sisizifejoraxofabuzuv.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111c36f2a7bf---zinovuma.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160702cf7f1bd7---bivegiromuxana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=cardiopathie+cong%C3%A9nitale+pdfPDF 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_off00010431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10431 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C48 10916 bytes
SHA-256: b33e662a9a88090dff82a7cbe0b8757ea7ca97622bcdc6517249f6e70323d8e4
font_02_sfnt_off000134f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F2 22264 bytes
SHA-256: 315cbf4392105b6b682fe693b2109428641c87e9e326f22a27dc29403d275943

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