Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbeba23acdb9db6c…

MALICIOUS

PDF

69.3 KB Created: 2021-09-30 19:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4331999bb442bfb4369d4db4fad772a1 SHA-1: ea47bd80e8ac845c266422ed7500f2c73c713fb8 SHA-256: bbeba23acdb9db6cca31d729a0b91aceefc1cb36afa1ee96db8541817e512d81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs, many hosted on compromised or disposable domains, suggesting an attempt to direct users to malicious content. The presence of multiple external URIs and a link farm heuristic indicates the primary goal is to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://zooiguana.pl/app/webroot/media/files/mazirugibib.pdf In PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/25089674311.pdfIn PDF document text
    • https://emenu.hu/editor_up/majaboxofufofurarepadusa.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/ee19731be659dca4f4de217f66f2faec/bevixakavosa.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/lilepubezixu.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/nafufugasizadisa.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/nolisukusotemeg.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/c54a7741475dc7a1a43d845c84078c05/bepunojonetaro.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/32263291361.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/vokuvorenufu.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/48980087481.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/ridaje.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/motuveruvage.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/58608597398.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/85760087180.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/kulituliwusawutokuworirow.pdfIn PDF document text
    • http://apcmagon.com/userfiles/90039463244.pdfIn PDF document text
    • http://newo.ru/files/files/72737148194.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/59211589425.pdfIn PDF document text
    • http://snsi.jp/image/news_file/18193649153.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/vuwuvomuduvarewojag.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/gr9tms89kii9qi4376p7sd908q/wunarobevenisotun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=free+mobile+recharge+apkPDF 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_off0000ae4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC665 10660 bytes
SHA-256: 0682ecdcfdf412cd72cc8830fe7d14646fbcc15a7ddc774a1823c50a8342d951
font_02_sfnt_off0000de7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7C 16124 bytes
SHA-256: 6fff52c8018ee2bc6641d9fad162d5fc32b9b94426af274ab9191173d510775b