Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6abdec6dce531e…

MALICIOUS

PDF

102.4 KB Created: 2021-06-02 17:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a3f95090a0a8d979f22523e1b50cee8b SHA-1: ffd74c8a5e511e0d600dda850e7444164fecb979 SHA-256: bc6abdec6dce531e56019d6dd7ded190f079fee78c5212eecb06becba0f63be6
236 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it's a lure for remote support tools, instructing the user to install or connect with such software. The presence of multiple links to potentially compromised websites and the ML classifier's high confidence score suggest a malicious intent to deceive the user into granting remote access. Although no scripts were directly extracted, the document's structure and embedded URLs point towards a phishing or unauthorized access attempt, likely involving a downloaded payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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 code/control handoff high SE_REMOTE_SUPPORT_CODE_LURE
    Document asks the user to share a remote-support code, connection ID, or allow control in the context of remote-access software
  • 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://chmelo.hu/sites/default/files/file/tanudoxiwezox.pdf In PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa17887a18---173654633.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/15320585875.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/wilonivudaxivafizixaxuvew.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/mosep.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/74bf50c59b40fc7784773ddd026cf484/xafevaxapojebuvinugowi.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/jubaki.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/b8adfe83aae9b0dcc8c5ee36fa2bdfc9/47900973140.pdfIn PDF document text
    • http://beiks.info/public/file/93137556017.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/mizikewanoxaka.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/7pu5apkt851h6idpr58ldjfu43/kekavowadumubidedes.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/gkf1b6mfpqs5p5t162cc9ri46c/31203700265.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160856edee699d---rofedubu.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/xopovilubimatafusofolara.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/34655238793.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b857f2ac5d---dogujidebawujuripukutuvu.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/50c8bd02761b863ca7581680ddd695e0/nefimisopikezilusutatuno.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=teamviewer+download+freePDF 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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00013a3a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13A3A 16888 bytes
SHA-256: 79eb96ad1268764744610ab24a1003f5704dfc1b39af5bf1c7d42df8d3928fa9
font_00_sfnt_off00012958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12958 4976 bytes
SHA-256: 88c81964361ccc68d0b3f2b5ae6655a0adf2248f35db4415650c136663db5dc8
font_02_sfnt_off0001687a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1687A 10588 bytes
SHA-256: d9b96dd2c2e211c319356cda6d7d681ff4257f51a0c1619b5d3a7123c2555e6d

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