Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e1976cadb56d21…

MALICIOUS

PDF

75.8 KB Created: 2021-08-09 14:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c49fa7593120707cb63d8674ff9a6750 SHA-1: 8987b0d0dce9ca325c8cdefce2c99f5df2894744 SHA-256: 61e1976cadb56d21238ff8668af0334f99d2c4c6ba37ec17798c42792e45766f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to numerous compromised WordPress sites, which in turn host more PDF files. This structure is indicative of a phishing or malware distribution campaign, where the initial PDF serves as a lure to lead users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16086fcdd7f129---ravusanopijemuzevi.pdf In PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/80986065141.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/b9927974e2117969fcfec125725e765d/84699402009.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a166ad9db63---57115269485.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/89507020260.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/78654548097.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/15884172793.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/2e05594f7268b6b12e02990c53743f9c/rovudiz.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e5aa72745---zoduguxoposufoj.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/ef3b84b9228139cc36469c9195863128/66597355575.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/lexoduzo.pdfIn PDF document text
    • https://avela.md/userfiles/file/gugipavumilagawijope.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68935b9071---66535316166.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790eb11514e---6795886354.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/sozakufoxal.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102d6f6f3029---44399908691.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/odms4jlq4br7c4nvuf9dutfe1a/49333722902.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a73084de6---pozakonajeturikezedavoxox.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/8871946093.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/76997132512.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/kewisuti.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bb032da54---jifumotamewe.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8ce9c5b65---2420988935.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/bizeputoliwabekusan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=yu+gi+oh+forbidden+memories+portugues+download+para+pcPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB391 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_01_sfnt_off0000c90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90C 14352 bytes
SHA-256: 0a61d61f6bfbc64a7192a6aa43c6ef11ceefbb6986b9de6f0cd028047cc3f102
font_02_sfnt_off0000ecc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000104de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DE 11376 bytes
SHA-256: fb4a65e796f7b9fec0c494c6215a5497e7342a16e202cfa195acbb2152ee594a