Malicious PDF — malware analysis report

Static analysis result for SHA-256 752df8fe0ca8d820…

MALICIOUS

PDF

75.7 KB Created: 2021-09-01 22:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9215c8accb018ac331e1d67f55a670b8 SHA-1: 1267d5245cb4f181b3a5aff909a2b67bc1afef6a SHA-256: 752df8fe0ca8d820ce772beedff2804c62966c5f7a27e1daf77d71b9ae9b86c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to manipulate search engine results or redirect users to malicious content. ClamAV and ML classifiers strongly indicate malicious intent, specifically classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://web68s.com/upload/files/44450148524.pdf In PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/ajg3qn2vpt4obtks2335an4gbl/biwiw.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080e92bd45ea---basajuvudixalidetozub.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/q54ubqg2uu8ra8ao0cn75188vj/fobobawawi.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/s005qavfsgl4ugpe5k5bnuj2jn/nunisosuzaxerenufelutamiw.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c437e6bc026---midulediziwozo.pdfIn PDF document text
    • http://duhochmis.com/files/uploaded/files/lawapigav.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/14131566216.pdfIn PDF document text
    • http://earthtalismanjewelry.com/clients/b/b2/b27d4d76c51cd35ccef873a204118430/File/tidufotujibetosuzivef.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/cb9e94edd2fca55027110dbc0e5207a1/jaxevenifeboje.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/rm2afr0n3e3t4aaefi9a7tr0h4/50026379982.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126e73c8fead---setiwaxuzigir.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/sutenasabozisukevafe.pdfIn PDF document text
    • http://sapaethnic.com/webroot/img/files/18096789193.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/nididubegegi.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/14082728772.pdfIn PDF document text
    • http://plan.msu.ac.th/ckfinder/userfiles/files/ganelufoludumu.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/9944789384.pdfIn PDF document text
    • http://realloans.com/clients/73966/File/1773133261.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/zeninalizepexujug.pdfIn PDF document text
    • http://flyingcarpetclementines.com/userfiles/files/jigozixi.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/46795703216.pdfIn PDF document text
    • http://kaies.net/upfiles/file/zeguzivivusewo.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/gukigije.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/jajoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=fundamentals+of+analytical+chemistry+9th+editionPDF 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_off0000c343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC343 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5A 11100 bytes
SHA-256: 07095384450bea60d5e6681162c5057f0c97dfd19abf3a91a1c8d5c973c8bad5
font_02_sfnt_off0000f515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF515 16696 bytes
SHA-256: e75f93293b0606a0ce9b1ccb76e7c89ddde61529924d0e62fa7be0031aec198b