Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aaa0884ae577d83…

MALICIOUS

PDF

101.1 KB Created: 2021-08-04 06:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a8a0a398748a6a963f40782d7e0ed2ba SHA-1: 3a22ef4d2091fbaa9980641d30b069368088b43f SHA-256: 5aaa0884ae577d835ad243b28af734c2ca1745b7a74fae7b2e7be73159e502d7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various websites, some of which appear to be compromised CMS uploads. The primary goal seems to be directing users to these external resources, potentially for SEO spam or to deliver further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://pmmagic.vn/userfiles/file/wamedubux.pdf In PDF document text
    • http://studiogiamberardino.it/userfiles/files/76160685235.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/01070cea142042d299b325079b8c9a3c/86608283267.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/33091552315.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/menakekug.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/85dilooe7j4m38qchapf905gnb/47031337638.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609bce268831a---xedebupigap.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/41371399851.pdfIn PDF document text
    • http://fabtur.ru/upload/files/36600052651.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d4fe4019c26---pogujokebuxelen.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/25681126564.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/84864337755.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e16e5ca4156---48869550983.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021072120265271450.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16102b8ad29a02---xidarisuferif.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/19170952787.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/91605503189.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/83652570964.pdfIn PDF document text
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/66824611122.pdfIn PDF document text
    • http://tion.hu/upload/file/woxonilaxi.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/94229368674.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb6b62ff52---38217681501.pdfIn PDF document text
    • https://airshow-bg.com/file/46226439086.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d86b3aeeb1---85008069645.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=student+exploration+advanced+circuits+gizmo+answer+key+pdfPDF 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_off00011eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EED 18804 bytes
SHA-256: 0a59cca72ef56656067eab844dad5f59599c50c4f040df7d46e936823ebf63ae
font_01_sfnt_off000150f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150F5 11656 bytes
SHA-256: 96ff27e066fbfaa5f0c7c963042a26abd50331195ed9cc5525996b0c2508ded8
font_02_sfnt_off00016ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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