Malicious PDF — malware analysis report

Static analysis result for SHA-256 17e5e2847f262f13…

MALICIOUS

PDF

93.9 KB Created: 2021-09-03 01:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0b1e7121a9b71af82a83e8a8c21a39c8 SHA-1: 6156591c6f346c35ef2c6cc7f0ef01d5b948f48d SHA-256: 17e5e2847f262f13966e13d33bf1e01fdf66b7634c54488909f27acb9215abb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to compromised WordPress sites hosting other PDF files. These linked files are likely part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbf6c16e8f---noliw.pdf In PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/99140206260.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/sgfht6nvubhacq8ku19kbsolm4/95877962830.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/33519025164.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/247727607.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ed0092276f1---2219432754.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/motaj.pdfIn PDF document text
    • https://agatanorek.com/files/file/79803193797.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e499084455f---96533201651.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c457f163c---67072384888.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/jujikafigenivejuwuruniw.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/jirejujaxixovatekagufutif.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/634303d0eff146d9da6f9a43916e8017/29157736556.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/ea1c1ef1423cb2bc1d7b9d539b4032f6/rimijesibonujafat.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/jomebunizedebu.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074641fcfe28---zuvijib.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/nowom.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d7d29217f58---71714187463.pdfIn PDF document text
    • http://gchs1969.com/clients/867877/File/17048145520.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160be267e8afc7---tesitavaj.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/9147d3332570a6e754ea1b3b65da6b18/jusedeluworodulamexi.pdfIn PDF document text
    • http://generoussecurity.com/uploads/tabig.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/8e8065b48f4bbba15a678ccd062572e2/xewisotilitirufarosoxe.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/pvb2ehtbt74pg07g3aur257slg/25116910267.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/xesaxoxuzakesinefin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=nebosh+igc+1+revision+guide+pdfPDF 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_off00010cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB1 17160 bytes
SHA-256: df8a56e63555f078a19d9efe4d41be0611c291f670102b4cb01ee4ca875a25b8
font_01_sfnt_off000138f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15107 10928 bytes
SHA-256: 4bd4e2093964ae946bea9ef9a56255fc3a2d4489e997187028dd6a8b0051b079