Malicious PDF — malware analysis report

Static analysis result for SHA-256 15cf6db784ff8ede…

MALICIOUS

PDF

82.3 KB Created: 2021-08-23 15:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3819e53c8e01247bfb285dd8a58ec1f9 SHA-1: 12e43d48e6b5fc6a1d2242ea8f18c15dfba8722f SHA-256: 15cf6db784ff8ededb64c15ab3c1ea9baa503a8b0584c5283aa6358c8fe45fd1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The 'SE_CLICKFIX' heuristic suggests a social engineering attack designed to bypass macro restrictions by instructing the user to manually execute a command. Multiple URLs were found, many pointing to compromised websites or disposable hosting, likely serving as lures or download locations for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://infrive.ru/uplcv?utm_term=how+to+increase+your+dedicated+video+ram PDF link annotation
    • https://wagaskar.com/media/69466009893.pdfIn PDF document text
    • http://franckjuery.com/ckfinder/uploads/files/fulelolojowogomukuj.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/woropunosowol.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d5aac61d8---nawokufosugeru.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/wejipemav.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/38isosg8efajdt23eujuolo7ul/wirojedavubov.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/zozipeda.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/8cbf0cf72feb55020bdfab37e7d4a1e7.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607254a82a7dc---71079187072.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/63879099904.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/kajevidixenizolokelov.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adecde41719---jelenijafupedixuzur.pdfIn PDF document text
    • http://szpk.hu/_user/file/78679961116.pdfIn PDF document text
    • http://cityhighclassof77.com/clients/9/9e/9ea685038b5a197d2022a69b8c6b162a/File/pepugevefo.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/1685818866.pdfIn PDF document text
    • http://michellesmithscott.com/clients/36670/File/17824232378.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/906818dfab272d14c6e57a758cd14881/54466267765.pdfIn PDF document text
    • http://unibox.lv/files/text/41743165055.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/nagutiribijikodijima.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/516780b9518f5e931844de9354e2bfca/gilavawuxitikumodimuv.pdfIn PDF document text
    • http://sgpeo.pl/users//file/zuzaxiximurorinitefakaros.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/ocv3jnjoj2sfkmkjd4n90bcc84/fogid.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607231c5b95f9---91478760079.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/78364585162.pdfIn PDF document text
    • 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_off0000df42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF754 16664 bytes
SHA-256: 82dd8197e728fa60a0af442ab4a1b258b5e9489e53f4f7ca3424caec673254ac
font_02_sfnt_off00012287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12287 10844 bytes
SHA-256: 2c3b460512d957fe0f0a583a8bdc773c938f72f5a8d14794e4d31b31d82e494a

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