Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfcb4f40f5169965…

MALICIOUS

PDF

94.9 KB Created: 2021-07-07 20:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5666ee60e57456c512d80b97f19c86ff SHA-1: 778bc3106b926948a700e6722148a68eccba8d79 SHA-256: cfcb4f40f5169965254ac0d0cd7bd12b9665b82751177f88a846bc88be2e1cd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, many of which host other PDFs. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using compromised infrastructure for hosting malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

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://weblative.com/wp-content/plugins/super-forms/uploads/php/files/frn209q31ijvqa6qmd21i0ktc6/mekomenejefanasunetuzag.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a87511c6e---tukepalasopavuwekawuto.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/b6ac0264d97f319c10d056469b12fd4e/zamutaguxonilejatajera.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/7v95curc2scje1jgc7sa5pbfpd/gewivexanojogeguvofidam.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/13782882246.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/ea57b37775724cc26bd145de99328338/65924574731.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/80308145266.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/99080624101.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/453d606c095e6b24a8d4e6aab200bc0e/favuleguveninonanipida.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/18a5d3d3ebc7502f59b101873f26790c/rojobeloz.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/89607929350.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e4895195888---xubaxewonipurufazozesad.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/1815cf84e3dad9396f784f3f0a39830d/95526048460.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160afdf12226a1---judeposifuworopetamite.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5d4aea3ed---limukapifemola.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/36729392155.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/lazujopesinekef.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/sajowodorawufoxebafubines.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/9336646e621069967a6683109aa3e9b2/rojazaguzetovatozosug.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/d48062b3336a144d7008a7753bd1f804/9860088067.pdfIn PDF document text
    • https://chp-travel.ir/data/file/45094313524.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/2dca387659355a7f985a404c260ec979/52262272876.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/27941454678.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210616075650_j1bukp.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/madixefugedelopizuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=mechanical+engineering+project+report+downloadPDF 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_off00010d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8A 18008 bytes
SHA-256: c5f34c7f4dad09de2824e68b776e74918dd38a29c418aef04a6a0c05ba33e037
font_01_sfnt_off00013d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3A 10836 bytes
SHA-256: b42dbc8b3e625d6694eccef6e9ae49f0b31c24bb3d6412e361f67bc9700f8423
font_02_sfnt_off000155f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1