Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d468ae6930eeb8b…

MALICIOUS

PDF

85.0 KB Created: 2021-09-22 13:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d31e2f6ac34972c1503de25d539aab72 SHA-1: 68037e2d3544e5df29712789ac2d8bea1f0095f3 SHA-256: 6d468ae6930eeb8b24eee2f5afb6e4b56d050a63bc2f9005a34cefd2d60b16e2
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. The embedded URLs suggest a phishing or malware distribution attempt, likely leveraging a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://chono.mn/uploads/userfiles/files/vifanabalusebovoli.pdf In PDF document text
    • https://afma.pt/site/upload/file/kuvokekobubuvujosezonute.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1297e2a98---mimigilanadi.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142263125dcd---laforebofunovumixubogi.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/61039206534.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146a545b5921---jixixiwuselowuzutakevox.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/wuwafalenomelexalajevex.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/30590501295.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/88814699245.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141c3f7b5d0a---ridame.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/83082738052.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/koxavesekupuzatidoguxod.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/timaxukanubefulokep.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/resifurukoduno.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/23622341979.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/bujesinepas.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/10077708599.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/90886171829.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/36243564986.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409b0204631---27438476547.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/95474484079.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/10287691807.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/28046571535.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/70105781005.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=photoroom+app+for+androidPDF 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_off0000eb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB41 10420 bytes
SHA-256: d34b839e89739cdbc6c33a0db307927beef9f4d656f721da5327b2843d9b176d
font_01_sfnt_off0001029f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029F 17180 bytes
SHA-256: 8c62a1cbed4e5be227a767e9447494cf22492e3b006fc526cd3b0affbcfb3aa7
font_02_sfnt_off00012ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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