Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f5760393631757a…

MALICIOUS

PDF

78.5 KB Created: 2021-09-07 15:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9b970092a1967b7c8cdf225ce870e404 SHA-1: 99e7b293dcf194a7fb0a8c0d0b00fbbec02b75db SHA-256: 1f5760393631757ad540db29cd2257d5ae0ffda3f1b5a33a6bfdd4965a62db5d
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to potentially compromised websites or disposable domains, indicating an attempt to redirect users to malicious content. The presence of multiple links on compromised WordPress uploads and disposable hosting suggests a tactic to obscure the true origin of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wonkingchina.com/d/files/tezatafizum.pdf In PDF document text
    • http://mwflower.com/upimagesfile///sutowukikekisimazusurun.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16089f4638a364---tukuxelirurazadoxikemugit.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/d6b6f8de7ee44e4023fbdcffc32aad9f/86802634808.pdfIn PDF document text
    • https://datajournonepal.org/files/piwigibenote.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/92964253748.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/jawagogodajubinobepipow.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/27636028172.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/mobarigaxezilaze.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/75414456298.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/sativozuda.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/5596213ea0643622e1cef13437c44ae8/2685207510.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/fatikuzakokiz.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/tosutimifomutigixegebabib.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb4498bbb5---70779580593.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/60329142509.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/94353463090.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/vezonoxafonugutavoreg.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/wabozarudajitape.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16231723159105.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/f8800ae31bb53c9768f5780930be37e8/12013700900.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3c9110bcf---zosovipunede.pdfIn PDF document text
    • https://phunhai.net/upload/files/zarujupuxuri.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/1235fe666335de568dd494d36709109d/fimak.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/bubivexoninivojuje.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609c72a468cdc---vetitunezilijagobuxofok.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca76e539e1---41902619079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=problemas+resueltos+campo+magnetico+2+bachillerato+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_off0000c81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81E 19584 bytes
SHA-256: 2916033c480bdd6c859b2bfbc381704a8ca643eefe3d21d3ae8f80d2eb06a062
font_01_sfnt_off0000f903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF903 11428 bytes
SHA-256: 14c1558df85a66d93e68481dd848f8b158de9a536789a2c39d205313a12bb805
font_02_sfnt_off00011369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11369 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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