Malicious PDF — malware analysis report

Static analysis result for SHA-256 c87345b62dc162e2…

MALICIOUS

PDF

72.2 KB Created: 2021-09-23 16:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d3d30f18ccab3f3a3e9e5492394e3a7d SHA-1: d68b7bc678db2c91ec5f5b391ae4a7a068c9e14f SHA-256: c87345b62dc162e2e5e26b735b151027fcbfa11b508a503db87f52cd43ee73ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of embedded URLs and the nature of the heuristics suggest this PDF is designed to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=evadra+hero+full+movie+download PDF link annotation
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161421fcb074e3---30105885229.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/jerekepuxuvan.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f38a931a23---78488527282.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/37400715694.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/puvuwewaviludup.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/40344519472.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/zemukaz.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/58132762932.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/baxejubukadexesokeru.pdfIn PDF document text
    • http://chinalabware.ru/d/files/59220495325.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/60756156396.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/27790418846.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/tutuxiru.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/lawejofafegijobivisa.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/dubinitesazumirijikez.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/darexovubujufumu.pdfIn PDF document text
    • https://intersat.lv/files/file/fotivadosujidimizomu.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/67145145065.pdfIn PDF document text
    • http://asvpp.fr/pdf/9065313510.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16137a06d29906---senif.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/28896324578.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/16477929583.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/1750897007.pdfIn PDF document text
    • 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_off0000b878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB878 16812 bytes
SHA-256: 9347706dceac7ba387b4334829c4f662e7794a9964330d5855a540c4c23fa207
font_01_sfnt_off0000e329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB40 10588 bytes
SHA-256: 3f549a6804fd69f84fa1c9b393f8fcd672d7a6507771067d146f7e8a26e9f7a3