Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c6d13c240dda523…

MALICIOUS

PDF

69.2 KB Created: 2021-09-30 13:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 71e2cde799c7e3cc0827b6703dd50366 SHA-1: ba2c326f3c3f24f1c1b4077bafaa772d6ba8e947 SHA-256: 6c6d13c240dda5232ac8e94905377f31eb07d922e0a5721271d701b038fd16a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL analysis point towards a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/wowete.pdf In PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/lb0fmpe8gnrgf6rd5kl7vdnhu4/89043522810.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/85509711246.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/22874346307.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/39656951573.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/90529335378.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/161556ba111af5---zozotozu.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/rapebimad.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/786986014.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/tuboxogimufekozuma.pdfIn PDF document text
    • http://devison-matras.com/upload/file/72034744732.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109141738525492.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614c9da871a45---89409359194.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/17572443607.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/bcd6d8fd8524b40a0bc799641d3b7ea5/26432697621.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/24619351524.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/51317694084.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/13086952424.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/vevakibobug.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/dawisapewa.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/tifebirado.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/84817653952.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/74297462112.pdfIn PDF document text
    • https://shaksheer.com/app/webroot/upload/files/samidobokuno.pdfIn PDF document text
    • http://www.sunriseacademy.in/ckfinder/userfiles/files/52894268943.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/b3r812n6fg3pav0ostgif3i2f3/gunura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=young+jin+choiPDF 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_off0000b25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25B 15632 bytes
SHA-256: 424d583b187fd4ed8efaecaf1412181923e2b569612e4ea5fda4c0a3a8f03681
font_01_sfnt_off0000d970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD970 10016 bytes
SHA-256: ab65ac4a9296d6b5b6787d49d6622f7f94b5a75ab2e0ff7a6c82f54e9b3c916e
font_02_sfnt_off0000ef86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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