Malicious PDF — malware analysis report

Static analysis result for SHA-256 63adf330502663f1…

MALICIOUS

PDF

83.6 KB Created: 2021-09-14 06:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a280afc97d7f491d655629494d3abca6 SHA-1: 67fe02d0a6f0d4cc64505d0fc359c497e99bda82 SHA-256: 63adf330502663f1ce99dcaca45aa408cd3106dab74dcf39db118b799e25e9e1
196 Risk Score

Malware Insights

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

This PDF document exhibits malicious characteristics, including multiple heuristic firings related to compromised upload links and a remote support tool lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document likely aims to trick users into installing remote access software, potentially for financial fraud or unauthorized system control.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oniceh.ru/uplcv?utm_term=remote+desktop+android PDF link annotation
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325742ebedf---lovep.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/83709125857.pdfIn PDF document text
    • http://uhorder.com/upload/files/lugolisutubunefevaguwa.pdfIn PDF document text
    • http://leeandrewdavison.com/download/pezozokimu.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/12270740265.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/1584385678.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/domajatiwegeratumenuvova.pdfIn PDF document text
    • http://stylekd.ru/files/xomijuramefosoxepoforugaj.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109011508595476.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/42223642369.pdfIn PDF document text
    • http://esterkins.de/ckfinder/userfiles/files/29173314256.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/40846384098.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/5776e58add08c221eb3c715cee2d2190/faxuwuboxegodowevijeponu.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210914104809.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfec4a87e8---99236811348.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/vapizuxepuf.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/85661430983.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/ketavevubulikemojixut.pdfIn PDF document text
    • http://trevorhannant.com/62787675712.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/19195657559.pdfIn PDF document text
    • https://tl-systems.hu/files/files/xepur.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/wamonimezudiputefedimex.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/23195374284.pdfIn PDF document text
    • 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_off0000e330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE330 17516 bytes
SHA-256: 2d66f6ed99cf14b5a882950a5ed186ddf6941f5db6db4c5d1cb49bc769af9bd9
font_01_sfnt_off000110d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D9 10644 bytes
SHA-256: 070afd31ef4f1691bc15297f217ef88006e7d0f635d5f3705a8772d57a65c2bd
font_02_sfnt_off0001293a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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