Malicious PDF — malware analysis report

Static analysis result for SHA-256 4462a8ea3833996b…

MALICIOUS

PDF

98.0 KB Created: 2021-08-03 11:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 953220bdca95cc0c15326882115c89da SHA-1: 4f704b2c4d09180a7b929edea7425f43198c1018 SHA-256: 4462a8ea3833996b7df2782f404431427fd42893f5907624c190457b9d62e84c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites, likely to distribute malware or facilitate phishing. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

Heuristics 6

  • 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.
  • 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://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe35f67e7d---12108692206.pdf In PDF document text
    • http://highendschmiede.de/highendfiles/file/funolujekemalamoratigel.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/59892973793.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/jq2dkjn6sf7de9ji8pm9kthd36/11505578712.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/pojewisodus.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/30361872252.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/c48101807e4d502d663e1c3c376c0f9c/mafufukukoxibaxa.pdfIn PDF document text
    • http://goref.ru/files/file/nimopobidutuladutosod.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/roralesizotagirame.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/69690379496.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/tapalunubivadoveruvageg.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/46033205411.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/34a2544afca6c57964291ea1091811c9/sofesipagurutuxewemu.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/24ff525813f55e8412e0bd12bfcbfd5e/3825407831.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/c6004af974a28fbd26a644a1b377f7a1/38944526887.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b9e6040c2---44518865876.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/mofanimoxagatowam.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609565bfc057a---25439783377.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af48e85b75---42368006245.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/87982127678.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/8bcdfc0678e15323985246247f442985/funedukolumuluxafaveve.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/30719325823.pdfIn PDF document text
    • http://kinogigant.com/sadm_files/67974564510.pdfIn PDF document text
    • https://koratspring.com/upload/file/vizegovozolabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=lightroom+mobile+dng+presets+free+download+zipPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10312 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_01_sfnt_off0001188a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188A 17448 bytes
SHA-256: cc36b7e0e12d8a312131c9dc2c8410580b2b36237876ec3e71e0283b2da8291d
font_02_sfnt_off0001464a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1464A 11188 bytes
SHA-256: ff0c140657d75472fcb3d653e6e38fb3c9ee795d92695e38bf456ac83ca7a475
font_03_sfnt_off00015fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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