Malicious PDF — malware analysis report

Static analysis result for SHA-256 c196b2a6fb1f2028…

MALICIOUS

PDF

82.7 KB Created: 2021-10-05 15:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8addadc040267b8c90f374a3ff765bdf SHA-1: 11ef4de7c35906c19afdeeef375fce2f98e10832 SHA-256: c196b2a6fb1f20288a30db6abf14d1770423835c50a5016b5229ecedbe444f13
196 Risk Score

Malware Insights

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

The file is a PDF document that exhibits characteristics of a phishing lure, specifically by instructing the user to install or connect with a remote support tool. This is supported by the 'SE_REMOTE_SUPPORT_LURE' heuristic. The presence of numerous embedded URLs, many pointing to potentially compromised or disposable hosting, further suggests malicious intent. While no scripts were explicitly extracted, the PDF format itself can embed malicious JavaScript, and the ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b3db8907b9---difap.pdf In PDF document text
    • http://makrostal.pl/user_images/file/dawijopapi.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/betaratobunorigove.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/62044382731.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/danarumujatusamofokob.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/fezufokidaju.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/30211467529.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/forerozutawelopo.pdfIn PDF document text
    • http://wamer.org/userfiles/file/pijuzijo.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/fiduzatevuk.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/53330500974.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/lagoregixede.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/vobenimejotelekojevoxa.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/jaliturobimibisodetituxos.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/lusesebuxamosov.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/nodukegimawo.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/93562570468.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/18880918977.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/31385b6bb8012fc3f271cc698d74c4bc/kotumepevivinirafevati.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614ea4d8be0da---mibosumozikukidod.pdfIn PDF document text
    • http://muszempilla.com/files/file/99629114548.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/lifepovejusi.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/boritovanedil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=chasing+cars+around+our+headsPDF 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_off0000dc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC93 18708 bytes
SHA-256: 0271b7ad3f43586a21122b2ec5a59a03fcb2ffdb173102f4a783c08aa19c8dcb
font_01_sfnt_off00010cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001250d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250D 10636 bytes
SHA-256: 921853d5c8a2179d349e71f99a3fff440ddd6bd7f61a17f2196bcec1354de223

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