Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8d64d96df8cce0…

MALICIOUS

PDF

74.6 KB Created: 2021-09-18 20:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3ad22bf11d574d7e8906a41a6c65bc59 SHA-1: 053ec5bad13fe3c9e5e4465fbbec5980094eb6e1 SHA-256: 3c8d64d96df8cce042d843756296b9bae124d3ea8b6bb473df9f0fbb9dd26656
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs pointing to compromised WordPress sites, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded JS, though not directly executed in this static analysis, is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e5c67a10c---xabekasedujogod.pdf In PDF document text
    • https://umutisi.com/umut/upload/files/budawekozapin.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4bf6d4188---poraxamopisanovosumem.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/60902993593.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/nunozesugekamodilub.pdfIn PDF document text
    • http://poiskvod.ru/images/file/54207206406.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/77818450446.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/89971226673.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/51387417794.pdfIn PDF document text
    • https://nexapos.com/upload/files/sasufuwewuvugifixalogu.pdfIn PDF document text
    • http://esistore.com/userfiles/file/kodewofubigugun.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161390afb6a016---jixiwomafilamimagebumik.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/lagawanujunezikofumo.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/diwon.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/zipefigoleritokasedire.pdfIn PDF document text
    • https://2winit.com/Files/files/fijiwimirir.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/budilulenomab.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210918_035601.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130eba51fac6---92989146754.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/jononoveritugemefad.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/55970412199.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///78686508753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=gifted+full+movie+eng+subPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/besatoredepilu.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_off0000bbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD2 10780 bytes
SHA-256: 6c341c51853f47bbd33e3ea4d1a88bb16b786c04384354f8308d6e9e4cf6ed0f
font_01_sfnt_off0000d47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47A 18756 bytes
SHA-256: d6a27df31f8a3631d91dc73ca60e9fee7a488c97e3ae2ddc42d1d83e6b19cc7b
font_02_sfnt_off0001051a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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