Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f8cb0f5b8b840d…

MALICIOUS

PDF

74.4 KB Created: 2021-09-18 16:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cd59ef5bb0b8ba085ebf6ea086f1eefa SHA-1: e521bba70bf5e733345d979b116d32b6706b2e1a SHA-256: 39f8cb0f5b8b840dd6539eeadcb9c4f27be267afb89d02ff1d53e14ca00dfaa1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute further malicious content. The presence of a visual download button lure reinforces this, pointing towards a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=download+pubg+india+apk+file PDF link annotation
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/22268707744.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/sujanokakupurimusa.pdfIn PDF document text
    • http://chinalabware.ru/d/files/vozefanolixiloxu.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/90679665687.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/metavabugevepuxuvafiv.pdfIn PDF document text
    • http://meskerjager.nl/media/files/roxakobowuzuketoz.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/98204477562.pdfIn PDF document text
    • http://katela.net/userData/board/file/bumirajijowaf.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/getixoxufefex.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/fb78q4knlptor9tukiepu0ssvi/62774543369.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/30305528877.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/2552218153.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/bimeledawas.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/84412180141.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/54364402675.pdfIn PDF document text
    • https://designclarf.it/file/76043909714.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/nabuja.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/13622478180.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136c75e5899d---43542468720.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/xazomezal.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f595045ff9---71200769048.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131879da8430---mavabab.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/xekulatoginabiwuwute.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_off0000be53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE53 10724 bytes
SHA-256: 2d632652d55277a6116f27f697c1ba121e4dee2381a85cbff10f89a1a233dfd7
font_01_sfnt_off0000d69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69E 17616 bytes
SHA-256: 2f52ca1131e79a8f4622247406d3e9f3aa10892d69e9ede654aa4d40e69999ae
font_02_sfnt_off000103ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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