Malicious PDF — malware analysis report

Static analysis result for SHA-256 f005819c7fb994d9…

MALICIOUS

PDF

87.5 KB Created: 2021-09-10 02:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7eae8542f931a121d3c46ba9681aebb1 SHA-1: f6bf37e4286cae72f1ba6df4c9208c4f790646e7 SHA-256: f005819c7fb994d933242afe783d82e22dd387d6ab375e6ff1e6a6ce50fb3cc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on potentially compromised or disposable domains. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests an attempt to distribute malicious content or phish for credentials.

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 http://svx.su/ffile/file/83021486056.pdf In PDF document text
    • http://surmounttravel.com/userfiles/files/11918276256.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/38535583565.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/voxitut.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613748ff30f5f---sawew.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/rubukuwukuxo.pdfIn PDF document text
    • http://datcat.vn/2018/file/65938038625.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/xizunosarugelaxokebepu.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/texokegetibigivi.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/sewogeninu.pdfIn PDF document text
    • http://qwerty.pl/_data/file/suvoj.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/xapapogoxurolaguwudepil.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161304368d34fc---jetojaredomag.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a89d13abc0---tumiv.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0d5d93138---45935834259.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/kimiv.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/tajeri.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/gataj.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/dililejomudodaxeje.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/nebobajuvugesewowup.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/30217500959.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/27948798777.pdfIn PDF document text
    • http://agama-rc.com/upload/files/2703797626.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161315593b3d4e---8995791138.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/67906636717.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/sikubogeteveximumeji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=the+magical+language+of+others+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_off0000ee2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2E 18644 bytes
SHA-256: ea5f921c779d838f773dacafaa89885987f897ac261d5408811aae1fa841c56f
font_01_sfnt_off00011e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001365e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1365E 11132 bytes
SHA-256: ccc0a8d91b1e6db96422ac91624141f1be29514da7fb9f9bf433acf0129088cb

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