Malicious PDF — malware analysis report

Static analysis result for SHA-256 f27da58371939cb9…

MALICIOUS

PDF

72.1 KB Created: 2021-09-25 16:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7ee3c2f5bef7c9f048e6f7c30fcac0a4 SHA-1: 7872bf7f879323cb6068942374453a2c17297c18 SHA-256: f27da58371939cb9556c51414a1dbfc4fad86d7fbfa75aa3ac230672f4d82832
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. The presence of embedded JavaScript and multiple links to compromised WordPress upload directories suggests an attempt to host or redirect to malicious content. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically points to the use of compromised WordPress sites for hosting, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613395bca4dca---zosatapawubikemitumen.pdf In PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/38121762637.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/gemolog.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/16002902108.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/30753261999.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/12146263185.pdfIn PDF document text
    • http://sdds.be/userfiles/file/josareradinufowabejoja.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e856662e7---22133724430.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/41075742108.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/b4159976473bd3a91c36b1f4cd223c6a/51692257601.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021941610389516.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/85662669653.pdfIn PDF document text
    • http://unibox.lv/files/text/27690320132.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/bubager.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143932178b84---gupeg.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/22314619586.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/kobisisababereteveva.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/32de4222d05a6e696cdb7a3d6e771011/61447558899.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/70194605006.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/kitanudu.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/rokexosulenubawagisizu.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/kosojivopewefisarodogeji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cycle+of+snakePDF 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_off0000b539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB539 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4B 17912 bytes
SHA-256: 7ff42222f02551112a5baa8f0d596860e692b68da0434cb61355e5001d777900
font_02_sfnt_off0000fba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA2 10276 bytes
SHA-256: 50f9176b2db6e67e7552faaf8d3d2015c5af0200835eeda2c89e9188c7f2847e

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