Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dbb6235d2f8d104…

MALICIOUS

PDF

107.9 KB Created: 2021-09-03 04:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a1420dd449cb0b7828fab45236dc6f39 SHA-1: e209b384cd043ff84383a16607182e7a70365f60 SHA-256: 7dbb6235d2f8d104f8e6e479cb6e9398dee9c69dd53eedfb8b4506659d1aa8f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/5702ca87df4b9dae235e3903b23e8c5e/36440492510.pdf In PDF document text
    • https://ecotranslation.ca/upload/editor/file/fudenot.pdfIn PDF document text
    • http://splogservice.ru/content/file/75231987508.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/5cc271r936sqfuk856170hbcs3/mosoviboxime.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/rexemabuvute.pdfIn PDF document text
    • https://luminex.pl/upload/file/majafagefepaxa.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/98690509899.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/2443d8a174393dd998fa367f4c880153/zurateva.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160742dbc50cf5---rigujigubakirik.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/62674100780.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/gejiwetulapu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610dd4cfdcdf2---tuzawinulopugazunud.pdfIn PDF document text
    • http://amirmazandaranihospital.com/ckeditor/files/files/83576920685.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/xiduwokewaj.pdfIn PDF document text
    • http://russia-ex.com/doxisarefipetabe.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202106261327162211.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf450adbf5---rexozuxesuzewalixujawajag.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/kigedogikizoteputixiwariw.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/4226ba8c7209ee2c8e2d741b6f3282ec/9187297689.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/69312776879.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210706_64B0928FFE157620.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/45824121635.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608d93a68676e---2852145164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=unseen+passage+for+class+5+in+english+with+questions+pdfPDF 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_off00013eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EFF 18464 bytes
SHA-256: c630ef3accaff2121c7da56ee143d2c1fbda3c0c2e51d204fef1fbabbda8830d
font_01_sfnt_off00016ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000186fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186FC 11372 bytes
SHA-256: ceb8f4f385f1506840d0cc5ddaa1b4429570333bdee5d39f10c3414d079f7149

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