Malicious PDF — malware analysis report

Static analysis result for SHA-256 9091ba6e3f703e4d…

MALICIOUS

PDF

75.3 KB Created: 2021-09-14 13:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9864875cf50d50845b030d12964a2765 SHA-1: 1a366e9232e9d6e9db43021b12da54972aad07b1 SHA-256: 9091ba6e3f703e4d3c4f73870f47dfd42595c4772d2a75e5a6dd2dd45cb8da22
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple external URIs and link farm characteristics suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://kayapaliinsaat.net/file/depuxeg.pdf In PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/novinup.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/e41ecb9240cb3b12b15e8aa8e79bfe2a/66318740590.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/775cb56ec9b101781a4f96492b9960f9/5391168669.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/birowutut.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/negidadopo.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea2e5e1882---wezixasowitawijenum.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc554f10bb---dagimokopotales.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/fesenozuwozowemiduxodabe.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/70166715462.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/mekefuwatimilir.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/benenilodizomejakodekupuw.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/sulitusexunozite.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/17950085756.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/rorewerovasumuluviretu.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/46701545555.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/zujonuzixujak.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/vimupile.pdfIn PDF document text
    • https://greenways.at/userfiles/file/rajolufobofase.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/62143433921.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/dolufoxilema.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/xegevupomojogumuzisuzi.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zogabeputimikeresizamak.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/viwunik.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/12398263257.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=truck+driver+crazy+road+mod+apkPDF 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_off0000c41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC41A 16700 bytes
SHA-256: 061205ea10daf4508aa6ebf7cae291c264ca35e5c65c27dcf075e924689838ee
font_01_sfnt_off0000ef4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4B 10652 bytes
SHA-256: 8caa5e1b9b781e9ae7699807c4a5c40a82b0a10afeb95c9add4561ca84dd22a3
font_02_sfnt_off000107cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1