Malicious PDF — malware analysis report

Static analysis result for SHA-256 5607e07797599131…

MALICIOUS

PDF

81.1 KB Created: 2021-09-15 21:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d2097fda8ca32e8dd91c8425960cba5 SHA-1: 1bb65eb91fe15ecadf49ce0fcf544d488bd4f9e0 SHA-256: 5607e0779759913134d3f30c27de7dda5d93fb690a34d733d9a97b3ac017c294
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external links, some of which point to other PDF files hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a visual download button lure further supports a phishing or social engineering attack pattern designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://netflor.pl/upload/File/kaxiso.pdf
    • http://ahzgbh.news-read.com/upload/files/45563359561.pdf
    • http://www.mousumibanerjee.com/fckimages/file/28288661359.pdf
    • http://aromacosmetics.bg/assets/userfiles/file/doxud.pdf
    • http://langmoon.jp/js/upload/files/rupam.pdf
    • http://cuacuonbinhduong.com/upload/files/78928715969.pdf
    • http://gysanya.com/upload/file/210915223503612674jg3bnkimxwi2.pdf
    • http://gartenmessebau.de/uploads/files/junibo.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161352dfe9f27a---65336156322.pdf
    • https://mytshirtcreator.com/app/webroot/files/file/rafujuberozideleritepe.pdf
    • https://chineseclothingonline.com/File/18400654581.pdf
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/salitavuramofunogedufu.pdf
    • https://birudongker.com/contents/files/81929130655.pdf
    • http://tekizolasyon.com/ckfinder/userfiles/files/84000534902.pdf
    • http://campbellelectronics.com/uploads/wonitivuwas.pdf
    • https://careersourcechipola.com/files/public/xofimufiranofate.pdf
    • http://trevelsi.ru/ckfinder/userfiles/files/pexamena.pdf
    • http://cellesekorea.com/ckupload/files/62098140191.pdf
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/wodoviwepaf.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf8dd4c78c---50055923276.pdf
    • http://autodilykanka.cz/cmsimple/images/file/41416074618.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/l2r0i01ljqdnfv5jbgojvfhmn1/73318252250.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=android+decrypt+whatsapp+database
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d90a.bin
3efca2c3bf217f44b242cc2999fcbce4e28dbb0246f107adbd0f7436515e85f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xD90A 17516 bytes
font_01_sfnt_off000105e3.bin
d391c66d232ac287b81bc27f7ee7f46092cee725d7242bf6d653088cce4d0998
pdf-font-stream PDF embedded font (sfnt) at offset 0x105E3 10888 bytes
font_02_sfnt_off00011ee9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE9 16792 bytes