Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed6808592670a87d…

MALICIOUS

PDF

73.1 KB Created: 2021-09-13 12:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 68e53f1cb5ecd47b657df4aadae0441f SHA-1: 616f4963b962a4f3d6cb5318ffecf7e90b11f3b5 SHA-256: ed6808592670a87dd024502f8a178eb82fb3f8b944c6ff7f8c670498d16af314
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicating it functions as a link farm. The primary purpose appears to be directing users to external, potentially malicious websites, as evidenced by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/9515f7770ev3k179q8sritl6p7/xasejok.pdf In PDF document text
    • http://ritadas.in/userfiles/file/46692032778.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/83593009220.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/simufurasowoxowatet.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/p5uj7677n75ij0pt2t5ojlodhf/towotibune.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/jutedotezimadetuminomiv.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/busowagikex.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/kulopaxedelejolafavaro.pdfIn PDF document text
    • https://eniedu.com/data/file/20210904183811.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/wenujula.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/38159662971.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/89209939061.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/vopokasiliwetewupol.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/zuvevuponujipubupono.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/watokawuni.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/18788118468.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/88008962511.pdfIn PDF document text
    • https://morabia.fi/images/file/jarawejunoxigisuxiso.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/fives.pdfIn PDF document text
    • https://5udua.com/contents/files/lewopufetamu.pdfIn PDF document text
    • http://adveotec.com/img/file/80074726672.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/048f72b16513bac51d103c62f2409bb6/rekukabilowap.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/tawugiki.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/87585041971.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=sync+two+bluetooth+speakersPDF 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_off0000b8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E6 17300 bytes
SHA-256: 70d057b5d3995ef303f173b1b9477f200208f2c7c2a7341ae3799834b2e62180
font_01_sfnt_off0000e5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCA 10984 bytes
SHA-256: ec2b5f32a84858cb8a2385a81c77f2283b73834d0b1822988ad68b916d09b5a3