Malicious PDF — malware analysis report

Static analysis result for SHA-256 e533fb0191894629…

MALICIOUS

PDF

72.8 KB Created: 2021-09-10 18:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8fc67e750edee0c8d0ea028b4d2b4c0b SHA-1: c03b3f2aa135b762b593a7ac8dc9ea850e4e5a66 SHA-256: e533fb019189462959e2ea11f9cd9aa800a8af266d3c170def06f09aae7c4573
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on potentially compromised or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV/ML detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://saltokisport.com/uploads/files/49792848160.pdf In PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/pefukitivanadefetagiga.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/lifufipiropuzolebebine.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/fafisurininazebotuf.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/42714360685.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/bavewegivajaripavexad.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/zujafozavakewamuvepenigo.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613920b2a4b16---14057880917.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/91385122924.pdfIn PDF document text
    • http://weldingplaza.com/files/file/nogipurirujifefonajusof.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b7e7f1a45---seniworewuzekotu.pdfIn PDF document text
    • http://dakov.hu/_user/file/gopulegom.pdfIn PDF document text
    • https://nexusmediation.nl/files/76173319535.pdfIn PDF document text
    • http://rs-entp.com/upload/file/27126646992.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/88258759502.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/62156695266.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/26538806464.pdfIn PDF document text
    • https://transdeliveris.lt/userfiles/file/94101399813.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/lsh4kg2tck95p25vtgfr4lmfvl/vudoxel.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/pobadunawomiwukosudukidix.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb89f50012---podipekefuniwa.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/12285205113.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/47441662395.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/buzugazojomikulax.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/wutilovexib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=wwe+12+ppsspp+iso+downloadPDF 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_off0000b997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB997 10436 bytes
SHA-256: e80c774c1e60dc9e9ee14700f5f9b15829a9b404b74c79c6e6c0feb427e2fa10
font_01_sfnt_off0000d17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17F 16836 bytes
SHA-256: 07ef5fde96bfe482ceb4fc0186be5b02c16869ad811351814628c1c76250be91
font_02_sfnt_off0000fcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1