Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c7ddba6d36d501…

MALICIOUS

PDF

75.5 KB Created: 2021-07-09 00:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4cbf9f95306792f3f86f76d7f39d902c SHA-1: 2ff9b27a94a9668a3936f0b2076a991155224db7 SHA-256: 75c7ddba6d36d501d9b589d36b4a12e8a31db3ba6122b07118922865079e11c4
156 Risk Score

Malware Insights

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

This PDF file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://csc0512.com/userfiles/file/20210607005028_7h3glg.pdf In PDF document text
    • http://goldartline.ua/userfiles/file/duwuzemububelorugezovin.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/bagoganapo.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/tofuwajibupika.pdfIn PDF document text
    • http://kleiberit.ru/files/file/nuxetev.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/b499d66f94051bf3872c75a9e2000944/tosunabakolixesu.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/27413063415.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93f8744395---lisefivoxonigojadopom.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d90c0a96c26---82189177006.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160723085466e3---17165124947.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b684f1e69b5---zaderesijiniwerino.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/2259babdc444522af4d8254f14820212/madepetonamevu.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/dulubupivowinigumisup.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210522120023.pdfIn PDF document text
    • http://goref.ru/files/file/36227442658.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/risexuzevemigurizuv.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/255318f112969cd097a8780d081dcbd8/63632530518.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/b617a8b05864921df251d87f173c94b1/fowajegigagezezunol.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/pe7kogjpv3epne7c44elemghu6/fagozudaworowozidojaxobas.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/64389944724.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c3c6dc689---firisafituvunaxeran.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/42462813504.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/4898977848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=basic+electrical+engineering+by+dp+kothari+and+ij+nagrathPDF 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_off0000c312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC312 16732 bytes
SHA-256: a75fd2fa94e9b17b735c48d43bcb0c95c211ba7a0924d9a5137c14e08d878d7f
font_01_sfnt_off0000ee3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3C 11320 bytes
SHA-256: 7ba15a0f5c6bf0aca8e0f32799419506c760d30ee014075a31f4b0bc36cc6cd8
font_02_sfnt_off00010868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10868 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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