Malicious PDF — malware analysis report

Static analysis result for SHA-256 b70e762926d99685…

MALICIOUS

PDF

78.9 KB Created: 2021-09-03 15:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 684539da6fbcbef6908229a825bcc1a2 SHA-1: ad9df832f50474eb00cb047fe043019b4cef7231 SHA-256: b70e762926d99685280c7d93b302c6a4dcdf1e6a1e0e3bd1686799a3b6adb8a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/e0ee9228ebf32b839aa67db8b7f84fbc/97018224658.pdf In PDF document text
    • http://farmina.ru/uploads/files/76009999372.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/diruvepajama.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077688d3da97---xubigip.pdfIn PDF document text
    • http://cobmedia.hu/include/pajupisosumetimopos.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097c0b95030f---34131506203.pdfIn PDF document text
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/rexeve.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096221d4f359---93268356658.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/90863765206.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c30e59f45---31135646059.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/webiwafe.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/29844749183.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/0d6906eb55a45ad8f6b32fe16e55f6c1/pekavapo.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/66298528597.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/7461761a3b1094650ae42c348ed669b6/luwizesofa.pdfIn PDF document text
    • http://clubchic.lv/c/i/files/71716236372.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/oa09u8o97big6kbvddodedc1fp/nufolixutamazeji.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/455a902b9007b3294a3f39d72290ffc0/13897668563.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16075df628ab1a---subitapi.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210822_114246.pdfIn PDF document text
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/25711592497.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/37967847904.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/ganuwufolezidavoregomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=form+15g+download+pdf+for+pf+sample+filled+formPDF 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_off0000ce0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0C 17960 bytes
SHA-256: d1db6ae53ee34f083e90d35e4cf74782c9c730605ed3c3b5721c7a461e37833e
font_01_sfnt_off0000fc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9E 10992 bytes
SHA-256: ab632d5f247f85084cb426606bc0b06d2c99951def25a5a94049c4f75fc3dea4
font_02_sfnt_off00011608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11608 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1