Malicious PDF — malware analysis report

Static analysis result for SHA-256 aabe783cf13ee59e…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 20:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b2bb0faebd2158cb0cb45a294a54ae4d SHA-1: 0b436941ab00ec716894acfda97677983f30645a SHA-256: aabe783cf13ee59e62318f8d08e0a40131a8506fb3396cd010ba2a21c69a4211
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised websites or disposable hosting, likely intended to redirect users to malicious content or downloads. The presence of multiple external URIs and link farm characteristics strongly suggests an attempt to lure users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://sieuthimaytinhcu.vn/upload/files/89556321305.pdf In PDF document text
    • https://auto-rujo.com/images-editor/file/vaxaxomepaxemovili.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/88358808994.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/29881253144.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/57313650851.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/92514256797.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/63545718072.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccfd9a3345---jujitoxanixujup.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/suxubaxiganuwap.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/purozatosi.pdfIn PDF document text
    • https://foulardfotografando.it/file/24623656983.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/puwezuwimimiwono.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/ruzipekunotib.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/lonomakoweromowerib.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/27895213311.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/7e0c56c0624ef1b6b85afb70b2771114/damadatezelupevoxujugexa.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210907_1DDE2A617D8529A8.pdfIn PDF document text
    • http://apart1day.ru/file/99567847068.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/lodekebumokakosekisuv.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/voxidod.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/37493097112.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135b4e6a87a0---76442650764.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/33688141710.pdfIn PDF document text
    • https://chptravel.ir/data/file/mefofuzebav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=play+store+download+apk+latest+version+2020PDF 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_off0000d818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD818 17240 bytes
SHA-256: 3d59ea7b67d26e066e827c496bb3dba8c4f28622250747fa03307398cceeb0b4
font_01_sfnt_off000104ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BA 10988 bytes
SHA-256: dd7068d352a32d7f6c70e09c3a39054307a15fa7aa5c1547eb3a0e43774e93e4
font_02_sfnt_off00011e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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