Malicious PDF — malware analysis report

Static analysis result for SHA-256 991da79cc245a2ed…

MALICIOUS

PDF

85.6 KB Created: 2021-08-10 04:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3d42213a268be1f6c20d66a6cf8cffca SHA-1: 43c1f49fc00fb110b9e4c237c4f00a342d8d1db7 SHA-256: 991da79cc245a2ed08eb4f298a8d0be550f348e9261e70c5e0f3f08f7e22a2d2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users to phishing sites. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded JavaScript likely executes to download and execute a second-stage payload from one of the numerous external URLs found in the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://broadmoor79.com/clients/864886/File/52929683664.pdf In PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/gn4sf1201t6bqtjitqq5mddfj3/wupurezuxopubevozikipuxe.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/m99o6nkq9fofap8higpn4qnr2q/61603363036.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/dapezesem.pdfIn PDF document text
    • http://ore-processing.ru/d/files/dudajozusezinijukidule.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a780fc4554b2605934515bf511f07d9f/57592938086.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/54183883682.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160adbe473be2e---17265265292.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/kajemoj.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05f28e901d---85058870954.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/baec27262f1fb577ced1483fec705ef8/nedus.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/b3ssjog0rcn5q7fl7vcs7ek7q2/ralidemu.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/26218531464.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/d0445d3abc6f768d1442344e0f6c7da4/nirilek.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/6489286047.pdfIn PDF document text
    • http://xnucleus.com/members//member_images/files/girazaneve.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/jibefok.pdfIn PDF document text
    • http://africareview.in/userfiles/file/sedopibip.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/2452ecb4f4a0549ceda157893a574fca/sisikewifufutetaxas.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/53680606182.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/vesisezapirazofowokujaxu.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a271be2d42d---karozapabujewinutiluxugip.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/tubarit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=tipos+de+vitaminas+que+contienen+las+frutas+y+verdurasPDF 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_off0000e793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA5 18508 bytes
SHA-256: be72a7bec2d18fb94e49f878d3d24f45bcdeccc8f074e2ceae407e58e3dea9f5
font_02_sfnt_off00012f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F08 11168 bytes
SHA-256: ec661c51e605969d414ba704754ffecc35853e682b70943b13d74214cc998547

Open this report in the interactive analyzer, or submit your own file for analysis.