Malicious PDF — malware analysis report

Static analysis result for SHA-256 65f3350aa21128f7…

MALICIOUS

PDF

77.1 KB Created: 2021-09-18 18:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6d243234c274ae8092b590078a160c37 SHA-1: 0835959781006986ae56d838e9eb75db2961f4dd SHA-256: 65f3350aa21128f7c08877fdd76e670ac4f5ffd0684e8a95d079f1d445159c08
196 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, with heuristics indicating a remote support tool lure. The document's structure and embedded URLs suggest it's part of a phishing campaign, likely attempting to trick users into installing remote access software. No scripts were extracted, but the presence of multiple links to potentially compromised or disposable hosting sites indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://giaydantuongphongkhach.net/images/news/file/wibipe.pdf In PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/61080113639.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/feveremipux.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/95854537418.pdfIn PDF document text
    • http://portableandcool.com/files/files/lurudovu.pdfIn PDF document text
    • http://pb-book.com/user_file/file/36793147286.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/3799125423.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/84655544169.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161369a06c9e4b---jakuduwew.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/jiwofebaninarelitigi.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/gisagiguzofob.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451f307f96d---sizegelam.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/25128628088.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/rebarixenerak.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/vezowakitifotigoxabol.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/82492806112.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/20253400421.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/lk54hgi1vlva65kf7s2ckj36cl/tajebowonewikawuzazen.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/40869725772.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/pedaluluvaz.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613604bfe12b1---80742337208.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/serugevodebuni.pdfIn PDF document text
    • http://soc-in.com/data/media/files/rafunelanodeveliwa.pdfIn PDF document text
    • https://autoskola-scp.com/files/79239003569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+cast+phone+to+laptop+via+usbPDF 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_off0000c9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D2 10756 bytes
SHA-256: 49b095b3a1fac163614f9bca28ecd8e2eb20de0799da6ab554b56e452fedaadb
font_01_sfnt_off0000e255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE255 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA67 17372 bytes
SHA-256: 9b1842c62f819056fde389e97c8e430cdc512a178be025f6042110944c18b122

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