Malicious PDF — malware analysis report

Static analysis result for SHA-256 e270c865b8697989…

MALICIOUS

PDF

80.3 KB Created: 2021-09-20 10:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f6c90976961b0b1e4209f81f5526a9ad SHA-1: 369537a8e2277e5f951c0e4932e01df52efc47ac SHA-256: e270c865b8697989ca51544d90e9833775397d583f6a4b08913333f55797aadf
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document contains embedded JavaScript and multiple links to external resources, some of which are hosted on compromised CMS platforms. The presence of a 'Remote-support tool lure' heuristic indicates the document likely attempts to trick the user into installing or running remote access software. The embedded JavaScript and linked URLs suggest a multi-stage attack, potentially downloading and executing further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://veiligheidsslot.nl/ckfinder/userfiles/files/13047245925.pdf In PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/24891366569.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/zuwovedipixeba.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/nosupodivolixavobabivibar.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/49906999401.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614826b754c92---72671060869.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/66474913391.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/c38f6b7e7bd8cbfa8a69ddc0b0725fa6/jiwafosuxeja.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/tilen.pdfIn PDF document text
    • http://turnyras.lt/Files/file/judiloguwobojokifivep.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/spji0ch78q6k8sapnn57pgkt71/24304645550.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614813589c35d---81238149336.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/87461286977.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/fivijubikidisor.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/buvosu.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/refego.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/fudopexusuv.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/63078809374.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/97561164791.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/4a39pajl579f9r57jpoo1djonk/60601334821.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/a35869c62f6b8236f8b20180e2474dfe/widapubuziv.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/sugap.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fakisedebewupedekelesu.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/89764953552.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/75205224951.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/zoxivojewikemudomipewuji.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210905_BAB61AAF50AE4048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=watch+full+episodes+onlinePDF 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_off0000d4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F2 17824 bytes
SHA-256: d453495614954281d4ef2eee3d9ec3fa2936dee7ad213806f888b4c8418e8667
font_01_sfnt_off000102c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C8 10708 bytes
SHA-256: 7373e6a481ac9b8ea4d6dc1da17f34c15d199d4148014986d5ad1d5c3cd21414
font_02_sfnt_off00011b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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