Malicious PDF — malware analysis report

Static analysis result for SHA-256 06d53eddc179dba1…

MALICIOUS

PDF

85.8 KB Created: 2021-09-20 02:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c5249103f2afa7853d7df7c42ac42a8f SHA-1: eaaf639e760c9426e0ad300359fd5dae9bb74295 SHA-256: 06d53eddc179dba16fcdf37fec5442f5772e658aef0ab5d6f64ef20851f7ca9d
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URLs, some pointing to compromised CMS uploads. A critical heuristic indicates a 'Clipboard command execution lure,' suggesting the document instructs users to copy/paste commands into a shell. This, combined with ML and ClamAV detections, strongly indicates a malicious intent to download and execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=custom+rom+xz1 PDF link annotation
    • http://poltinik.ru/userfiles/file/11831603817.pdfIn PDF document text
    • http://elskenecologie.nl/files/59610199365.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/wosifirazozatavijonanoj.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/nejizavoruzagozek.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/jaxemituf.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/9680d6c8519aaff8be7e114289070633/wexavivugawot.pdfIn PDF document text
    • https://majubesar.com/contents/files/72798689856.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/86204770583.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/sepedexexazubifovogudopa.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/titixeleju.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/wagegubilisog.pdfIn PDF document text
    • http://cheevalome.com/image/upload/File/xipegorufokitokoxel.pdfIn PDF document text
    • http://naviway.su/upload/files/mapodanafetujozowazut.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/rozigefaboboroxuvilel.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96347968070.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/2453c90dc6d84fa06a698fa6dc8f2e53/kusirorutezuritavuwilepas.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/94479551962.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/gesadis.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/97901362812.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/dokaraki.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gigesetagezura.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130900b0e0a6---wusuzusibavosimefubir.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/tukoxotare.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/76018284510.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/fojuripofow.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/zedanenujiwagenoj.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/pekexoris.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_off0000eb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB34 10080 bytes
SHA-256: 1efbc244a7f1faed6f0cc092f2b6c8d53b51b4c8368788190dd6075d77ad1fa0
font_01_sfnt_off000101ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CE 18500 bytes
SHA-256: 891a3b4914796cdf8da09cdc3f501f7a36e675c112dcbef8736aa882978d48b1
font_02_sfnt_off0001318f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1