Malicious PDF — malware analysis report

Static analysis result for SHA-256 574c2de4d176bdee…

MALICIOUS

PDF

83.4 KB Created: 2021-09-20 19:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9214ac14e59e8c77b68ea80dceede83f SHA-1: 207424dcc5380efde9bf74f24df3cae02ec9d48d SHA-256: 574c2de4d176bdee7a60a84ac33a57a687a15e6990156d24e8bd238a1635fdfc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm pointing to compromised WordPress uploads and disposable hosting. The embedded JavaScript stream suggests potential for malicious code execution. The primary attack pattern involves directing users to external PDF files hosted on various domains, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://doxity.ro/ckfinder/userfiles/files/48230134359.pdf In PDF document text
    • http://solarissoft.com/img/userfiles/files/rixutenijemiw.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/xopotunotudovajogo.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/98657700497.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/gijilajozukotexurusuruji.pdfIn PDF document text
    • http://infracsap.hu/files/file/tomugo.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/gajema.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161444806de0fd---54674997458.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/nijifavekurijadelatiwasi.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/fokekonuparuxu.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/vixotidorob.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/44342779459.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/tubogawazazow.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/e3iamgkumkulvlg2s9grpjm7t5/fevomuso.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/43498283398.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/33289064408.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/saruv.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/bamujowomovalazagewew.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16146143e1b074---kisetojekodeluvomobob.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/vifunozuj.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/sijefodalifubuloju.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/boxawevelemelozalaxew.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/58445236151.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/tojumanavaxifofekixo.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/bikanivisavoleru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=s5+mini+nfcPDF 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_off0000dab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C9 21036 bytes
SHA-256: 6e8053640041b5ce4071e8a8ed516839e766d8f1a36a806e7af9b5cb49c382af
font_02_sfnt_off0001293c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293C 9880 bytes
SHA-256: d1f7ad6dcd11d9b07b553d3f2dbfa0efb9468e51d5977150d077a1d7b067d251