Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e67c77cb1d596c9…

MALICIOUS

PDF

82.3 KB Created: 2021-09-03 19:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 814b97c0e14b12760b99c9ddee85253e SHA-1: c056a7944e16482c984b00cbeacd32e97ac200a7 SHA-256: 0e67c77cb1d596c92624ffe62703803d1b121b9a310b50122c15c6d487589820
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, despite some being marked benign, contribute to the overall pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://www.bramfordgc.co.uk/ckfinder/userfiles/files/86963292697.pdf In PDF document text
    • http://novichiha.ru/pic/file/vegika.pdfIn PDF document text
    • http://drironcat.com/images/file/35606531654.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/pepidemor.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b7b10d84d---31611866230.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077f863b1c6e---bolus.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/fubovasov.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/vadebafuzasamune.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16072e24d6d7f1---366216480.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/29000578956.pdfIn PDF document text
    • http://marine-inox.com/i/File/88575667667.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e0092ae2d---95633681184.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/japimanezegafalatedepax.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fbb5d8b61---25729426364.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b15b675b735---93387268492.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/18774353999.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/pogupu.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/epj0132648f60mukel21ipa7k4/62181730161.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/domonagisa.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/zovinada.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/95798615247.pdfIn PDF document text
    • https://subarini.ro/mm/file/45486494013.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/gezubujebese.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6400a50ac3---rimikejuvubujeveri.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf29190cf3---81920851956.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/68474014070.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/89960481541.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/vabemiropenafen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=suds+scale+worksheetPDF 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_off0000ded8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED8 10624 bytes
SHA-256: 9aad1448ba924d9bad8a2c98909a85ebc660d8b37fc6dd565f10a39e84bb19e2
font_01_sfnt_off0000f76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7E 16888 bytes
SHA-256: 2dac03dedb89e1329d2381b9c9b1533553f2abcc7e41a9936430e6220947b6db