Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba39febeece0359…

MALICIOUS

PDF

71.7 KB Created: 2021-09-26 22:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b6f36716b48a14f4183acf8ec83f4136 SHA-1: 1fe3e05a854b0a023cd69c9c96d386bd244ba118 SHA-256: bba39febeece0359dedf324fe581d5469e4d6b96a7bd3dddad0b495a3fc279e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a deliberate attempt to create a link farm. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common vector for further exploitation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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://yourwebcenter.com/files/file/33239240399.pdf In PDF document text
    • http://www.dereformasenalicante.com/archivos/files/sirumajanedadap.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/72817601483.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/powodiseniwufinimi.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/48421362287.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/f6e922c914b90aa54d00c75fb214108e.pdfIn PDF document text
    • https://kawinlari.com/contents/files/mowomamewonezupuzud.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc3534419c---vodimolovasub.pdfIn PDF document text
    • https://edarky.net/data/file/84294810947.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/lawowexebakonuxome.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/93779324265.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/28669138716.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/29b1b8798666e88b19b57b21b31d677e/27936462290.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/lepalazomigusurolax.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109250321025470.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/kemez.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/76648644832.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/49606218362.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/jofesoxopefiguwinosezi.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/39741340663.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210921111850.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/figiti.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/wasawekena.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/60172036497.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614171342630a---tinaruziwenex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=filmywap+punjabi+movies+2019+downloadPDF 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_off0000b3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EB 11428 bytes
SHA-256: 8f5dd09999f4c777a212833fe5216e1d5a66db133fbc155f75e44abfd4cb2f94
font_01_sfnt_off0000ceaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAA 16804 bytes
SHA-256: eb5af32b1835e3042ba6c686aae2b40c85b1cb0d2df146d037e23da537907671
font_02_sfnt_off0000f959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF959 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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