Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e87ec6b1478dc9…

MALICIOUS

PDF

83.0 KB Created: 2021-09-02 12:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f005a6ffdc245bd8216f2b17c2da98fd SHA-1: f544f09b84fd7241c5d9b99e06baaa92c89785c4 SHA-256: e4e87ec6b1478dc915c40f87948e5351b81bbb689a449317bba4a5a0dd980075
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also functions as a link farm, directing users to multiple external URLs hosted on potentially compromised websites. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • 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 http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089dff8111cf---40656233064.pdf In PDF document text
    • https://liantoong.com/archive/upload/files/gemodeduzex.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16115a2ddbed44---wenogugeluwuliwog.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/32666992902.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/64641464579.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/woxoliluwudum.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/32e76b29d69211dc3ac67d2c6fe4c011/36746394595.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/1783978435.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608427684bdde---lesoxawigizogulegifizubu.pdfIn PDF document text
    • http://raykingcarroll66.com/clients/2/29/292092747e06e0ab09130fa737b110c0/File/zosenusil.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/32264282120.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/momeladiridanizubi.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///mosoteduwamitufepe.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/55031062231.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/44014472535.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/3340a57ab7bf7a9bef3e3f5f9814150a/zigotutasisuwekonuka.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/73108284034.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8e106bb30---28331914049.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/14569567202.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/82492151792.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/41116570392.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/17872901096.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/45071800924.pdfIn PDF document text
    • https://fond.ru/userfiles/file/baripixaluvobaniwitulaw.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/mobegis.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/26888413811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=livro+despertar+espiritual+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_off0000dcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB8 10512 bytes
SHA-256: 5e9187520ce84ddaf01e53e17e8ed517972df211681eee994a6ce6a3867e4090
font_01_sfnt_off0000f4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDE 19552 bytes
SHA-256: af25f17ba9f69d7da4ff10c26f1d1c6bc845e8614bf69948ec3241b54771adaa