Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aad7cfd0b59f89f…

MALICIOUS

PDF

69.1 KB Created: 2021-09-27 07:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 068e7f0ea6d486d555f50662df4679fe SHA-1: 57c9404ee3ab77d1bbe073b6ed69391d5f3102ca SHA-256: 3aad7cfd0b59f89f44a2c0347a2622ab7f605ba381e13fd95829d5b96c681eea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also includes numerous links to compromised websites, some of which are hosted on disposable domains or compromised CMS uploads, suggesting an attempt to redirect the user to malicious content or download further stages. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://mk-sito.it/uploads/file/90955126846.pdf In PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/pojepe.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f5426d1c2b---telolesetivulakiwobiroxo.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/12694574410.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/41528725769.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/49932353360.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/fezijijaniromuniw.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021092707170229611.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/66118181905.pdfIn PDF document text
    • https://mytshirtcreator.com/app/webroot/files/file/wuzojova.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/vepakutanebevog.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/gewozemomuvalasabedi.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/kimewudubopuwepivuwuli.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/83989625372.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/5377308075.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/92655421751.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/10271208403.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/2764288897.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/xugimexewubipixat.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/vibemixazifa.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/nopewamepe.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/45277950090.pdfIn PDF document text
    • https://kopari.hu/files/file/44457910948.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/rukariwabudikapimoseju.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0d19dc49c---98553971332.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/1cf438513cfe593d73b48dcfad0a7d9a/20110001412.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=purana+wala+vidmate+appPDF 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_off0000b19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B0 14772 bytes
SHA-256: aba00334a9dc69443ac42609f8952a156d03181e1717675b5d483d38aa48f538
font_02_sfnt_off0000ef47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF47 10520 bytes
SHA-256: 727924e56a8425586d564511023f79ca215f2000c83d485c450cca0c701f7d0a