Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ba9946d3466d771…

MALICIOUS

PDF

73.9 KB Created: 2021-09-04 00:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3ab7d5268237d0cf5398b2a282336ded SHA-1: a585ba07d42367b2d1fb81b938fa02f885062ba1 SHA-256: 3ba9946d3466d771a549b6deef4f5393c51a645d3b25417912d90d0adb8bf74f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains a link farm pointing to multiple compromised or disposable hosting sites, likely intended to host phishing content or further malware. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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://tucarrorentacar.co/ckfinder/userfiles/files/57719906079.pdf In PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096a1ca41aca---vuvozeruwuwolizilopubupi.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/53889852235.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/89865261583.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/wupemiforopupipuju.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/leles.pdfIn PDF document text
    • https://luminex.pl/upload/file/19081609214.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/77271310290.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd21b0fc85---97667271790.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16093d4dd236da---95321140230.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/kimoxiporerosuvex.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/1e7e2546d06b469c6b4627dfccb7a51b/86523800962.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d43b18a3fc4---96559027963.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160801c966ae01---venobagovibozaxavamupibo.pdfIn PDF document text
    • https://linker.tw/files/77902145926.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906b997b844---54564541329.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1683a102e4---14121554614.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dba910670b---bosajurisagazedi.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/zulajegubekovudufajave.pdfIn PDF document text
    • https://pasarangroup2.com/contents//files/19293924461.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210902084432.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/51352c1f967296ead07ab6bae50a0a39/xufozetevijabajax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=branches+of+biology+pdf+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_off0000be3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD655 11196 bytes
SHA-256: d46f89fbdebf5d7279d21e7e7c427fcd1e37a9f3e5963e8a35a6b05bf0bb3c8d
font_02_sfnt_off0000f019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF019 16480 bytes
SHA-256: 749bc4981a3266521bcdfff0b8ac9c893286a062705e7a52da1a11ad98bf16f7

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