Malicious PDF — malware analysis report

Static analysis result for SHA-256 653c0a735b828eff…

MALICIOUS

PDF

86.8 KB Created: 2021-09-15 19:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7630269dfafef8d594512b33bfb81954 SHA-1: b79d47fa85c0bf4698c7a88c36b3d313c27ce940 SHA-256: 653c0a735b828eff72a753fc829a6475e6bb314ee3be7add951c934ef420d9bb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, likely intended to trick users into downloading a password-protected archive. The document body is heavily obfuscated and contains no readable text, suggesting it is designed to exploit PDF vulnerabilities or deliver a payload indirectly.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pantanalmsnews.com.br/ckfinder/userfiles/files/rerekuwitijuwerok.pdf In PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/lemologopamuvawejoxidix.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/fuvesubefadojuwopawemoj.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7c0063549---gexusaxajuwawuxukotemu.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/83240684619.pdfIn PDF document text
    • http://temple.mo/userfiles/file/fezejujukeliwi.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/51740764545.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/45046217813.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/b9c742e2a500c65dc87fcfc9fe850beb/jaludutexixunarobe.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371a9724e75---62283231293.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/vekirivom.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/82142680458.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/pidirepokotafijubunetora.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/nazis.pdfIn PDF document text
    • http://ladna.pl/user_images/file/16316926911.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/tupepi.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/60909986683.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161301af25fcd4---pulowawasibanelijup.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/26659702237.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/9445497270.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/begokufikesexusu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161410bb27f82d---91291814189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=como+ocultar+mensajes+de+whatsapp+en+androidPDF 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_off0000e7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DA 20504 bytes
SHA-256: d36e393b2a3d71520736a99d811c561d78ad0f72569943cfffb9b8af033cd36d
font_01_sfnt_off00011be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE7 11128 bytes
SHA-256: 4aa4d24988396f8da5b318cf7b70fbc9d55d04844c2aebd2dc06f60afc446d75
font_02_sfnt_off000135b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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