Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a954f440d9d0a84…

MALICIOUS

PDF

70.4 KB Created: 2021-09-07 22:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cf24fd2b1df8454fc5d39468e4ab3760 SHA-1: 2d507398a820fa3a605d30886ed9363bcc714a13 SHA-256: 8a954f440d9d0a845073af78114e038a35dbc8ad7de5f1c6201e6a9fcd4cc351
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, pointing to numerous other PDF files hosted on compromised websites. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript for redirection or obfuscation, and the presence of multiple compromised CMS upload links suggests a coordinated effort to distribute malicious content. The primary goal appears to be redirecting users to potentially harmful content through a network of compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://viceda.com/userfiles/file/60770755309.pdf In PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/hin45iiab0mcugoqn5rskf6166/vivawoxog.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/vumenoj.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/74083176755.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/fewugiduzozedefixiluxatel.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/lerukokuka.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608472f3d11d2---2234981237.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/d7b4756047add40e0cd280300d344825/miwudosewanirejotolorebas.pdfIn PDF document text
    • http://zuche0551.com/upload/file/84845362161.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e57e1f87a---kukab.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/degidame.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/riwejik.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/66691078526.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/30879724888.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/xemanajopezodisajapogaxe.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/46007795427.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/pavuwufejiz.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/29525970472.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072331c1b292---kiperomotukifanefapazuji.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/dobusoxaxobizenudopal.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/34991276275.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/12aa5f8dc3260d2d639788932d2f827e/80460144247.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/sf3ogmr6rbboviiiim7p6350bi/75738485659.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/9bb7a47c081b8456b2b40e50e2127618/mexatimiruvizamagu.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/6ae006a278d908b03b9d07650be25b30/mefagafoxisoxovoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=6th+grade+reading+passage+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_off0000b73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB73E 14552 bytes
SHA-256: 2961203535ce2bbd2e46d9b4feb8f42b9a3db915b120d2ef2f7a19f60ee01594
font_01_sfnt_off0000db83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39A 10680 bytes
SHA-256: d678e37f5c742cfe58ea0a6608d8cf7fa852f4dea30bb52b4a00299aca921189

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