Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d26c9a33945282f…

MALICIOUS

PDF

81.7 KB Created: 2021-09-15 14:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: adb24be9dd39602a11df0729651159ea SHA-1: 858eb06a0c1dde4c5e87472b88ed9b84729cc252 SHA-256: 3d26c9a33945282ff328838246f1ba7269b6b85a4d1a9a5a7cc9e4e574b5ffcc
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for initiating malicious actions. It includes numerous external URIs pointing to compromised websites and potentially malicious content, suggesting an attempt to redirect the user to a phishing or malware distribution site. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://smidgel.ru/uplcv?utm_term=can+i+see+who%27s+viewed+my+tiktok PDF link annotation
    • https://vietnamwelder.vn/uploads/news_file/takerobelupodugune.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/zugapiveruvesadedafunofe.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/gotebi.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/48755986330.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/kololuribazo.pdfIn PDF document text
    • https://fong-cai.com/upload/files/kuzodezipowugosawamat.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161395500c445f---91635695692.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/lunibutonepi.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/34843875561.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/fakijikapuziza.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/xinesatulitaxen.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/11872650447.pdfIn PDF document text
    • https://satesayap.com/contents/files/26143507869.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210908_043027.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/fepudibosanu.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412224bac7a---manotirabuxonom.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16141d56f09230---75701518282.pdfPDF link annotation
    • https://ibliberia.com/ckfinder/userfiles/files/61983704946.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/lubufelunek.pdfIn PDF document text
    • http://spiregene.com/image/files/20210915_135413.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353b1de2626---46168242961.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/78456807226.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/wopodunidojoderido.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161365568d74e8---mowalutupefare.pdfIn PDF document text
    • 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_off0000d8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E9 18124 bytes
SHA-256: a3aa5538c2b6833d45e229479a70b91d62332040df26ec9f0217fee094830709
font_01_sfnt_off0001081f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081F 10792 bytes
SHA-256: 3635bced73c8dbbaea2aa9a808dcedfd0d3c6642dd3b6c54812f327dd878e26c
font_02_sfnt_off000120fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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