Malicious PDF — malware analysis report

Static analysis result for SHA-256 0711677cdf68006d…

MALICIOUS

PDF

234.3 KB Created: 2021-08-04 22:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5674c17d0532aacb6ba7e9798bf367ec SHA-1: bdb8195ef745714ac8dfa6f63b8aa11e56a2f814 SHA-256: 0711677cdf68006deb9fb930c6cb86076f130a96b65e663e681d5466693d85b3
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, several of which point to compromised WordPress upload directories, strongly suggests a phishing or malware distribution attempt. The document body is unreadable, but the link farm behavior is sufficient to infer a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 5

  • 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.
  • 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://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a25752d3fa---11399044475.pdf In PDF document text
    • http://reutlinger.pl/userfiles/file/9790680566.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/16848545072.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/53900019539.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/qmccnj91406o7i6f9ga11gvq22/kisasopisox.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8e323bb3b---23461336046.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/4cf348efd932e61e24b7a4e3e8b5a6d5/66342009884.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/e3aa3dc240089d832a5a162bb104ecbc/28835243583.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/letovosovilutafuzexosut.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b829cdaca42---54664555792.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/29676433977.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16073ee2926e37---24534442735.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/3a45a462772d8c657da117d900bceee9/22171092777.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b735389687e---36432774842.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/71136921418.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/29349586101.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609016ef35960---49341829734.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/23b5fc3233c66a8e8b61a997c464232b/pinimuditinuro.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/555211140.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082a8d483ee7---18297566115.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3eb647e9432687e4f75fc45e1cd9afc7/dogexitonazobalisevajebov.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abf7adb419f---zeduwadarajusidunuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=wgn+channel+9+morning+newsPDF 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_off00033808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33808 18816 bytes
SHA-256: 4f62c506044acc986a2c425b1fe0df1f8ca4739dc4bcfe12c0329bcf51aaea07
font_01_sfnt_off00036991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x36991 10824 bytes
SHA-256: 0d7bbec90340aa39bbdcf2c4b70bc73f9a577a2329230f40a1bd94ffb0467216
font_02_sfnt_off0003826d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3826D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1