Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd509c7b5d52c515…

MALICIOUS

PDF

81.3 KB Created: 2021-09-08 17:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a32c38c722ad2362a0d0dc60302f2c5c SHA-1: 3a4d4be5594d5e63b71a8bae279ae150dc05d18c SHA-256: cd509c7b5d52c5153f9573a713be0aced5971ba4d62613095dba5dea2b17c905
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the download or execution of a secondary payload, contributing to the overall malicious intent of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613825947a48d---rugodegebanoburijagogula.pdf In PDF document text
    • http://anm-av.de/uploads/files/45333110593.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/25870732776.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1612fccdd0f825---31693352165.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/megogegudobuguma.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/poseriwuzaxok.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/janoposag.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b4d6bda44---nizezuvawi.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/27257180915.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/vapuzisok.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/11263212814.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/35093489522.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/49509921291.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/90269532846.pdfIn PDF document text
    • http://ternovykh.ru/content/file/71164200808.pdfIn PDF document text
    • http://cjpharmtech.com/upload/files/vadufisewal.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/muwajakalijedevexojofuva.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/64245286006.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/64822142576.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210906060150.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135c2f9c9a57---bozudaferujixa.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/desozifemekupojapuso.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/balozitekolezobavukajudob.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/94252897977.pdfIn PDF document text
    • http://kag.fr/userfiles/file/zeposatuderux.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613324ce80c8a---55718546977.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=radiographic+testing+level+2+pdfPDF 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_off0000d8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C3 11132 bytes
SHA-256: 97297395558aeaf9bb835f9fa7fd8473a00e0b8afd5a727026f1f83a1948c6b0
font_01_sfnt_off0000f28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA0 17400 bytes
SHA-256: 9c583f915735054ba04128ab697c99999a17e977055d6220372ed2926e4bfd5d

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