Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb1417aa9f36b9b1…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 13:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 510be727decadeccbf47d248ce1aeb7c SHA-1: 55e6bdfb0451c7973290fbed5871d1a6f505a6d7 SHA-256: cb1417aa9f36b9b1e75b1c06a58d49434c30e818ab5ae0aec8606126203ff46d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to external websites, including some hosted on compromised WordPress upload directories. The primary purpose appears to be directing users to potentially malicious content or phishing sites through these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://veewood.com/file_media/file_image/file/3753460180.pdf In PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/f6f2a85ddbdc2b29ecae1bf3401d5e0d/45061215926.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/jesegupijogupuwaz.pdfIn PDF document text
    • http://rfamilylucas.com/clients/73238/File/rupapemitopixotuxesozirut.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/29836077504.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f43fd5b370---35514430215.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0671499f2---paxewidaxinu.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/relenaximomeve.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210827075721.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/fotolojedotex.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/1110c49fcceaae284ae7804fdaf22dba/mejekoxijanegof.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607921d95ad37---wabisejevuluvisuzefabozu.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/sekelipiguv.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/39163594756.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/8961865236.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210607190039437224853.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/bowib.pdfIn PDF document text
    • http://spharma.ua/files/file/57443991327.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/8449524525.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/59267159296.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/molezobod.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f58f6d41ea---xinogaf.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/zibefunaradumagugeder.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/8f97e7299b01cdc3f61fd3a850b59d52/wizibale.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/75124280053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=spanish+at+homePDF 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_off0000e3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F5 10444 bytes
SHA-256: e18004f8cd5daab5d15e0a1002971e7530594c4117f6b6f65cba363c3f626146
font_01_sfnt_off0000fb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001138d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138D 17584 bytes
SHA-256: b7368b4cbe69a5838949905b351366d239c520ba25038bd8976cc51e34ba61d5