Malicious PDF — malware analysis report

Static analysis result for SHA-256 629abded6890819b…

MALICIOUS

PDF

70.4 KB Created: 2021-09-20 11:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b83fab395737b87bb3968c8db6f7b2a2 SHA-1: 59df6086751d51e0c3c9c793ad45c7cb78902598 SHA-256: 629abded6890819bc95619d98f722d7ce8497c85f002836a59f018aa69a47146
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier with a high confidence score. The heuristics indicate the PDF functions as a link farm, directing users to compromised websites and disposable hosting, with one URL specifically mentioning 'how to hack'. This suggests an attempt to lure users to malicious sites for phishing or malware distribution.

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://philabc.ru/uplcv?utm_term=how+to+hack+madfut+ios PDF link annotation
    • http://eptesteplelek.com/uploads/file/golugekodoboj.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/kipezaxikitipe.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/fofinixeremo.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/71080964687.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/59029882197.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/vebisosowuri.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/nuvipe.pdfIn PDF document text
    • http://www.ximangsongthao.com.vn/app/webroot/uploads/files/17802116307.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/zopuwagivixera.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/73951411082.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/22511074121.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147359c7a701---44578534968.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/25804544884.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/zamupudorovivunaki.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132be584e102---91412455195.pdfIn PDF document text
    • http://nktrading.qa/file/files/ruvogisutofenipadov.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/92269495168.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/fozupewezeviwodur.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021090119132413.pdfIn PDF document text
    • http://medica-brno.com/files/padusador.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/38640814812.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/77574457431.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161448d46bed46---fekezinepitolebupekobuto.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/133f62b347a94e21eb25733a92c2b492/fitofixovifupifose.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_off0000b512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB512 15344 bytes
SHA-256: bc6549cff47dc04a08b34a93440d543c0f71018b322eb06649d9a0cba6f2845c
font_01_sfnt_off0000db93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AA 10628 bytes
SHA-256: 0a205e05245e46361fdb01d997b22cc0980f47b7e3d029545dd73f053b97d46c