Malicious PDF — malware analysis report

Static analysis result for SHA-256 e40e96185b42aaf8…

MALICIOUS

PDF

84.2 KB Created: 2021-08-30 10:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0a42af9424381f48afa2328c04e5cea6 SHA-1: e244910fa9ccdf30f42611d47731abfc1860c86e SHA-256: e40e96185b42aaf88e8599b12ca1b600e94c113364fbe2d1be780b0a13878ef2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous embedded URLs that form a link farm, with many pointing to compromised CMS upload storage or disposable hosting. The primary purpose appears to be directing users to external malicious sites, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://autoroman-service.ro/imagini_ws/43463352589.pdf In PDF document text
    • http://collegium-connect.nl/ckupload/files/72786926496.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/ccsmunkqc9s849moi0rdvfgkf7/fugasobozara.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4954222551---59888382108.pdfIn PDF document text
    • http://candientuvibra.com/images/file/nebozupevif.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa5cea3513.pdfIn PDF document text
    • http://berkeleyhigh64.com/clients/9/99/99a482d4bd0dc5522cc24ea7f8204a07/File/xufowegiroreloderiro.pdfIn PDF document text
    • http://absigorta.com/E/file/lowuxizomus.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c219f774311---xamud.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/57730568551.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607635bacb787---dibatufavefezelizewa.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/masakoju.pdfIn PDF document text
    • http://cssh.es/img/file/ruluvexemuwewa.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/67bbce849442cf4940d0d0d0db293178/ladole.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/1v8u4ep3cmgtfqcnmj6ic6jpqj/60114103408.pdfIn PDF document text
    • http://cichanski.com/Upload/file/suwebeposigaka.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102cf94b7417---60342730199.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/niluretitaw.pdfIn PDF document text
    • https://brakos.it/file/sagud.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097413919686---mozosikatewe.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/24872448682.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/d3abc5392577e1825a1766221533c94f/xaduguputezupujelifa.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160856f38cb5c4---kotujimukobumifizu.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/fozifaferawemalexuvatud.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/90730126000.pdfIn PDF document text
    • https://stopserv.ru/files/file/juxubojoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=and+i+want+you+to+love+me+i+want+you+to+hold+mePDF 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_off0000df74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF74 10592 bytes
SHA-256: e82a2f8fac7bc20b2be0fa62abe90410ef50c1305c31f0309cdb136222a53d07
font_01_sfnt_off0000f77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77B 19128 bytes
SHA-256: a9839d201091d9be850406ac5edca851a4b20b60ce5393fb514c638df0960fa1
font_02_sfnt_off0001289d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1