Malicious PDF — malware analysis report

Static analysis result for SHA-256 732564b79b5976f8…

MALICIOUS

PDF

88.7 KB Created: 2021-06-23 07:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f02d87a3e81298eddd27ac53d456b764 SHA-1: aaf91cef23e7b27b4579e1df60a98f9bae143dd0 SHA-256: 732564b79b5976f85cdbe37356be1315991aca8fa0c0b8f951526b93e01427e9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The document body, though partially corrupted, indicates a theme of 'free word to PDF conversion', a common pretext for malicious documents. No scripts were extracted, but the presence of multiple external links points towards an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8007

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.
  • 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
  • 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://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/8c3d60ccf90e797ce3181ab9514bb6b7/morababebatolakatatofeli.pdf In PDF document text
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/xekisumopu.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/ad1f11c2775d9db66c050bd471785332/9953642840.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082e56a14405---dinogadunukubutawofix.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608c53763add3---52371760059.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/41445743048.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/12354037617.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/48174791688.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/wegubenuzodofobaze.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/58ef81c3d296c87eb810faf65b938f48/puwalirajob.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/fh5nuf7u1ide3slfgvrr4n52am/figatutasip.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a92aa3680---72882236088.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f8cc0527c---lapubunujilofasi.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093b2f7b1356---91281262198.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/9153e4e7069663c4f1e8549cf965f8ae/33093353450.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/69085000011.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=conversion+de+word+en+pdf+gratuitPDF link annotation
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12699 6568 bytes
SHA-256: 18f4960a52d64bc83d6c304eee4b25c9ca37eec54c0f4efd5701b5568bea1fd1
font_01_sfnt_off000136e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E8 5236 bytes
SHA-256: 657b12fb2359a1a45b01b616b50d00829c64d389ef7142812903e45d64cdfdcf
font_02_sfnt_off000148d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D3 2976 bytes
SHA-256: 0091b8b9fd55cd793e1a40d74f29157664259aa2b61778244d42d5a848e78f64

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