Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a4a73a9adbcb2d6…

MALICIOUS

PDF

85.8 KB Created: 2021-09-17 11:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f506e3bb7c576e414bd2a1adc6f96e05 SHA-1: 4090df4ce92e8108822e6380db4c6d98ff445e24 SHA-256: 3a4a73a9adbcb2d6b507ab39de6e66891cba8f2c5d4912d5c0b76acc83b799e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://ketchas.ru/uplcv?utm_term=how+to+hide+last+seen+in+whatsapp+android PDF link annotation
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/36083319717.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/48156081214.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/shaipu321atf5eq5em8a940qua/8055652268.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/zomivijomasowuge.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/4241863047.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/zefenuled.pdfIn PDF document text
    • http://nut-shell.net/upload/files/dewedadenadexasex.pdfIn PDF document text
    • https://viktorina.ledoritulys.lt/files/mivesalajuwodagifud.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613511412b95e---75429908048.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/kuzeravimaziwo.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/71252148024.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/78948458046.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/55671444501.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/107b68709b178e9992fc263eb6ecc0eb/rovosegikafozuvofejof.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1612f299e4ebf1---xitoduxogulinuruw.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/vobunofuva.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/forivurilosiposunukazeko.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/gajuroxurexusirivuxuwi.pdfIn PDF document text
    • http://falcon.dk/sites/default/files/webfm/xatuvaxu.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/matikigujugitano.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/t1p8aser96eljjigkqedcctud3/kelijewamafufata.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/36356039480.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/94464542016.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137f9e8039bd---wolonares.pdfIn PDF document text
    • http://adice-area.com/pictures/files/20791591101.pdfIn PDF document text
    • https://diphong.com/uploads/91089936904.pdfIn PDF document text
    • 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_off0000e9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FD 10568 bytes
SHA-256: 307edad5ab0f0efa4cc2f6d823f301340bd1894970ee1da0f87e33e7aef9bc90
font_02_sfnt_off00011a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A07 18448 bytes
SHA-256: b46a8b4e77b00d4c822936ae3ffc2724310ef958a345b24ec43f9a8c13703188

Open this report in the interactive analyzer, or submit your own file for analysis.