Malicious PDF — malware analysis report

Static analysis result for SHA-256 9774f559a1478db8…

MALICIOUS

PDF

82.5 KB Created: 2021-09-01 07:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 18b9b9ac126468bca83df0b575dbfb6f SHA-1: bd7c4a9e462f2195cf95127c0290f8c633a8aeee SHA-256: 9774f559a1478db88725fea1d46512629e3bf5a1b1a93829fe4004818fc32e26
236 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a heuristic firing for 'LOLBin token sequence in document text' which indicates the presence of 'powershell -executionpolicy bypass -file runme.ps1'. This, combined with the 'Password-protected archive handoff' heuristic, suggests the document is designed to trick the user into executing a malicious script, likely a downloader for a second-stage payload. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://odpadykj.cz/UserFiles/File/bexofifozetodekab.pdf In PDF document text
    • https://bititechnika.com/uploads/file/4039436848.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117b2f4512f2---lunamegudenogijeke.pdfIn PDF document text
    • http://fitviewer.biz/files/file/malavexemivevozupod.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/82100366807.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/30181135860.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/4277106558.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///32179765859.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/59046928127.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/ramaxelaguxojepulelovum.pdfIn PDF document text
    • http://mousike.it/img_ins/files/26818228064.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088290de42f7---lamororazekalatudikew.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/nidotorebabimi.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/b0c58febd008c3cc7781ceaec2415cd4/78261643378.pdfIn PDF document text
    • http://bakoca.hu/files/file/kirugalegumewatulolidit.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/90639696317.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/vonexokegaporuwarux.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608b16724f125---kejuzepujagixobo.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/funizasolupekuxuvob.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/74740296863.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202108291522592485.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16252664371695143.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=runas+command+with+passwordPDF 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_off0000da5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF275 10832 bytes
SHA-256: f05c7b18cb298a4dbb038fe836011e3763fdbdecfab1b0de87658d99b807686b
font_02_sfnt_off00010b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B55 18440 bytes
SHA-256: 36e0c760b5668bb56430c517f69814e67a60cbee31b0061e6a0b069902ef96ea

Open this report in the interactive analyzer, or submit your own file for analysis.