Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d4d92dc7fcb839…

MALICIOUS

PDF

80.8 KB Created: 2021-09-01 01:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b8c5955f1abc745b63b4eb4896b0ccd0 SHA-1: efd2adec779eac39fa6bde803ad7542305dab1c5 SHA-256: 98d4d92dc7fcb8393c45136c749a8e2558884be62910656261d89b9072be19b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to numerous unknown URLs, many hosted on compromised CMS upload storage, suggesting an attempt to distribute malicious content or conduct phishing. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://xn--80aaijzh9b.xn--90ae/documents/file/62245915875.pdf In PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021072714141_791345846.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0ce4c343c---62672576980.pdfIn PDF document text
    • https://songhong.info/userfiles/file/tifunaxugimepuwodix.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/libetepokuregakivub.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16092118a82568---30042791505.pdfIn PDF document text
    • http://motacademy.it/file/63413847886.pdfIn PDF document text
    • http://grandinspirations.com/clients/75274/File/38606383558.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160829b6f28987---76490413003.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/481d4aee381c681867bb4d96d3b6cf1f/32375030363.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/2101819957.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/18c4b95252b66c6e503787bce840738a/suximakoxafuxodinuruvo.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/fojojetidufepuxos.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/a583nbgu45mac1dbi6u115eurl/fonigalajom.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099fd304a543---22965102175.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/12156372951.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fa1b8f7a0---ximet.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a18affa4eb6---99922755687.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b477a2940e88e3ac180e3111cb1f2db9/kafakasaxawipuj.pdfIn PDF document text
    • https://latework.cz/soubory/jijakunibixizekagixud.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/gakulekeverexazamevamosi.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0d6fc5300---ritevu.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/jejofeloxexosawebasozuso.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd29ef49392---11772660415.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/16818371372.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/29623105267.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160951d9fc77a7---75126745844.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/41660be9b74c7b3a9babf1fbb3ecac0d/8585213089.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=eusol+solution+usesPDF 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_off0000db7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7C 9920 bytes
SHA-256: bbd186a06c4e98e18e16cc2e5cece1b97aefa027ee9c189c5c14b2a51a153a50
font_01_sfnt_off0000f186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF186 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10998 17176 bytes
SHA-256: 0b3b2d664f48475e4f6af0ca47e03f26621bb3a16a651e6e739117dcf12a0470