Malicious PDF — malware analysis report

Static analysis result for SHA-256 b88806daaebc0e05…

MALICIOUS

PDF

71.0 KB Created: 2021-09-24 18:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a52cb6020d228707568f6dd7f63b27f SHA-1: 04475196f032a903a9885cc0ef4cfbf084891716 SHA-256: b88806daaebc0e05be3e8a4137c8e4ed74582fa2cb8501144b4700912f7c57f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://kondicionery-shodnya.ru/upload_picture/file/tafitelujuxofipolivolivu.pdf
    • https://trinityautorepairs.com/uploads/files/vugidixozu.pdf
    • http://sooclose.eu/upload/File/92623879375.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/360fa685e2de0d57f9ada01278a86d23/65062906021.pdf
    • https://autoteam.in/ckfinder/userfiles/files/50196416425.pdf
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/37405960744.pdf
    • https://teater77.nl/userfiles/file/fokabupegaxuwapajegukeni.pdf
    • http://alfadent-volg.ru/images_uploads/files/zizex.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/14199b3a586c729917e9684d35308444/logov.pdf
    • http://fantacyhandicraft.com/userfiles/file/raruzaxidovugeti.pdf
    • https://daiichitravel.com/uploads/news_file/19253560232.pdf
    • https://jasz-pap.hu/UserFiles/file/42255257900.pdf
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/fabagorozezixisibovez.pdf
    • http://effekt-film.de/files/file/47008733086.pdf
    • https://eastmanllc.com/ckfinder/userfiles/files/ponovodazakajimaxajiniv.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edc78b5ae7---xegujux.pdf
    • http://emekyesiltepe.net/images_upload/files/wefaxibodugajadir.pdf
    • http://hosungtour.com/FileData/ckfinder/files/20210922_26E0D3511635327F.pdf
    • http://zavalinka.by/var/upload/file/45593619367.pdf
    • https://rajatotogroup2.com/contents/files/kisifavuzeb.pdf
    • http://clerus.hu/files/file/40120236900.pdf
    • https://rh4-h1tapi-turbo.com/contents/files/zutem.pdf
    • http://xahscw.com/userfiles/file/2932507225.pdf
    • https://ladangmimpi.com/contents/files/fotimelefum.pdf
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/50367840662.pdf
    • https://lentes123.com/aym_image/files/siwozebulumujusa.pdf
    • http://raffaelecavazzoni.com/userfiles/files/wipodubefor.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=amazon+downloader+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b30b.bin
cde1fec916ab5c5e3a57c21732a887b10654df61c49c81fcc473b919431fa9a5
pdf-font-stream PDF embedded font (sfnt) at offset 0xB30B 17208 bytes
font_01_sfnt_off0000dea6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA6 16792 bytes
font_02_sfnt_off0000f6bd.bin
be43f99402b52368ce0e1863b9108e7fe1a96363c97e323aa9cfc13859340f33
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BD 10412 bytes