Malicious PDF — malware analysis report

Static analysis result for SHA-256 a289e4fd29c59e59…

MALICIOUS

PDF

87.9 KB Created: 2021-07-18 18:38:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 44f070430de47d3b2a4402a3859c33b6 SHA-1: 9e285a75a619ebf2a49f3d8db23b2b86dddc2d6f SHA-256: a289e4fd29c59e5902576a1bd6f64c2ce49788e96cfd5a979940cf287158f815
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and embedded URLs are consistent with a tactic to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/83d062ed61f8ca7b8a64c1e020ed5674/65534879101.pdf In PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/89851378209.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078952340e5f---papok.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e850805cdb---buwuwetikifukazowi.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/708c458db809170d5ae441f5ea44d2e8/73810590174.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/3b5a9efc9f0b0ea4900564218101aadd/nuximixulazug.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/a18596af73ba71cb1dcc9afbef1efa33/fuxewibasujirilaberi.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/6378682795.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/2a2e8e0808eef0de1ccd6a68f243664e/24161285757.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/9073d99a7e088fb1e15e94e578feb87d/bixepizogujiga.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210529194958.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4ea3ae7e8---duxedefimopuvejavawugorub.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/f98890ee909042793f3e747194e78f2f/xurofilimufu.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be4f98b44c---99606853151.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/59243663960.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/wurixozowamabiwu.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8fa2dd03f---ziwixuzojobafivojubipiz.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d35bfdb8a27---rokobalexud.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ed5e0e0cd3f---bepaburoxolobotutebujone.pdfIn PDF document text
    • http://olivia-mitzvah-2020.com/clients/b/ba/ba4af741f15bd7b6832e7848668b55b8/File/38855150334.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d0f8de73c---90675196586.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bee84f81464---92979127454.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/38820477144.pdfIn PDF document text
    • http://rafaelokazakov.com/file/kamiguta.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/28357580917.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ac22261ec75---35827197695.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/jamenenaxoxogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=best+austin+and+ally+episodesPDF 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_off0000f493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF493 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAA 10552 bytes
SHA-256: 831881a6b8c8cc05b0a459e789fba1704649ade4f0e551d1af74616d2e9dc2b6
font_02_sfnt_off000124df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DF 17376 bytes
SHA-256: 2be988ec694894223f223fc094ef0a8c1d0413207efc7da7d5f9c26ccfc5581f

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