Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ad78e36ca91a0b…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 09:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8c0279098118090d7094ad5c8a67d178 SHA-1: e4c7ad6d6cfa1250c004bbcbbaf53f8980802500 SHA-256: c8ad78e36ca91a0b7442837be8a634feec92b8f6a9389a55aa26a713fd553559
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various domains, some of which are flagged as compromised or disposable hosting, suggesting a phishing or malware distribution attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The presence of embedded URLs and the ML classifier's high confidence score further support a malicious classification.

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://elsped.hu/files/file/mefubo.pdf In PDF document text
    • http://trust-law-firm.com/userfiles/file/20210911142932_506116834.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/barivikibizod.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/lamovur.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/kibimupemofonajojemasuv.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/dumitoxuwak.pdfIn PDF document text
    • https://siroyensao.com/upload/files/61784340823.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/86841790869.pdfIn PDF document text
    • https://datenglagi.com/contents/files/8640908656.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/13913767108.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/wibebuzasarokifu.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/sufowawuliba.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/janubexemaxugufebef.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/ce116acb7670fd7c4c5d7b793222743f/40075151903.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/50463942482.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1631805944_1.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/573d685f1fdf4d6222b2b92e845ecac4/xorumonaduwojosovup.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a037d9d8f---kokapurefezasuk.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/59104693892.pdfIn PDF document text
    • https://uangraja.com/contents/files/latojaruwewutejuva.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/bijavesanor.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210913_120323.pdfIn PDF document text
    • http://yensaovinastar.com/media/files/17595618985.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/6752667356.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/xufadagetenawereveva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=descargar+aplicacion+para+hackear+redes+wifi+androidPDF 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_off0000da4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4B 19380 bytes
SHA-256: a28aa278752847c79f5c84c00897b207702764fff88df36e02871cb550723a67
font_01_sfnt_off00010b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7D 10980 bytes
SHA-256: ef0efe2919fd489140585fed35a5d04fc36e63f8effbeb170faf783227a3a10c
font_02_sfnt_off000124bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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