Malicious PDF — malware analysis report

Static analysis result for SHA-256 9707ae7a0c688baf…

MALICIOUS

PDF

78.9 KB Created: 2021-09-21 02:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 652024ad949a9387845caa2584ddcb85 SHA-1: 77482d96205ac8dd7469c7b0ed9b75821a1d8246 SHA-256: 9707ae7a0c688baff28fbdb6587f2312fab941b03218bae7056c456b85b55ea1
196 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document likely instructs the user to install a remote support tool, a common pretext for social engineering attacks. The embedded URLs, many hosted on compromised WordPress sites, suggest a link farm designed to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • 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://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/f3d8fcabf6035eddd189d771502a89f5/nuwosigagofimuwof.pdf In PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/ripesegasedagusidaseru.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/zuvetadomik.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/nemedobojivegugejimi.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/katusuwigimefa.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/biwidukipotovinowek.pdfIn PDF document text
    • http://egitara.com/upfiles/files/25745184367.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210903_86B6BC30EE58C6BD.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/440fc08f6406e9948f5465faf2db1783/wepupujenawiz.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613446b5b5dc8---128974869.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/ziwejavitu.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/047a256ec0733e7e1ed02a5ef8129938/gosatasofekom.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/gejexikotefoliwup.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/xolidagategazo.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/1091999537.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/fasewogopaxarol.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/61234414878.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/82930516274.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/zagojulakofofavadabogixe.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/35033828321.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/36573838582.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/39580563943.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/24807855011.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/30603011804.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/kosapawuwegerofofizip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=use+your+phone+as+second+monitorPDF 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_off0000cfcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCB 17224 bytes
SHA-256: 74bcb59d660eb492799ac90b5d02960c291a3b5e7ec7cf395a2a7dd54175fed7
font_01_sfnt_off0000fc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC52 10956 bytes
SHA-256: b476e5a33a6e344c4f069c7a693a76de0fadcebce28ddbdaa3aee0648d74409b
font_02_sfnt_off00011599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11599 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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