Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fcfbd10ea9d3950…

MALICIOUS

PDF

97.6 KB Created: 2021-07-21 20:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 37454bab50e2c05accfddf88958a0fe6 SHA-1: aa11127b9ed2907cf631f83b99fefdf888e43992 SHA-256: 5fcfbd10ea9d395025676fb2131fd7c2ea7190fb587ec31cd0067d16508d228f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress upload directories and potentially disposable hosting. These links likely serve as lures for phishing or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea6bfe145b---dilagunitef.pdf In PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a434d0259---dakatizokaribixorokem.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607792f3cb241---tiwaveg.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/4212528418.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021717182159416.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/26482226326.pdfIn PDF document text
    • https://hirurgija.me//files/51806542981.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/deliz.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/janapi.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/f4a6dd66836fc9bcf8adcff19aa3923a/62267381367.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e4a116cb8---78424896585.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096ec4dc8e82---gewasixugewurez.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/d6807121a0b3a300f53c189b0bd04e95/57344588719.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/44a3e1e05be6fd343b5d4346f16c8d4e/sizijapudugul.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/bakuko.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/d36a31365c38a94988c30b70781fffdf/82980038223.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/30162326866.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/buripokelokakof.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/0vai6psm3hmvhs6kc0hltr8a21/10254860302.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3cf68bb323---rujiw.pdfIn PDF document text
    • http://aozbt.com/clients/3/33/335f642cf73e2ad82edc7dd4a76dad4e/File/83441300316.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/64922660251.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/4f30a2bb9ed963f7809ab95632621ab1/rojamikaletugovaz.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/43654038452.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608817d358943---komererada.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/u1hvpsatv1taf74kncg46d0v8o/vunixurodupuzozofaset.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=japanese+word+for+nowPDF 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_off000119fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FE 17756 bytes
SHA-256: 8eaa1c8d4ac244479c19e24b0fb167bf519a7f058c45f4f573df3c3cece4c6d4
font_01_sfnt_off00014834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14834 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001604b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1604B 10332 bytes
SHA-256: bac947b82be384263811869cf09552df0e5c39e68605ad97ec28a4115113a873