Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1391c466ad76be3…

MALICIOUS

PDF

87.9 KB Created: 2021-06-27 00:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab79137e0cb52b3c5e8785182e8d55cd SHA-1: 0f97ce85260f964914ba1843d67f20e6bee6809d SHA-256: d1391c466ad76be3188e7c833477891bc6d81c6d3736cc121f0d6b9a2580dd3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of external URIs and compromised CMS upload links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://cructi.ru/uplcv?utm_term=identity+and+intersectionality
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160926a830339c---dagevonaweluviredofofukis.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085269d5a4de---baliko.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607098ef3ffd9---72013255651.pdf
    • https://santechnikosdarbai.lt/images/files/22594448165.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6a6e3064f---39417315725.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/075b60cc6aa631069e7c973081033bc6/91047472400.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a461462200---83423529246.pdf
    • http://a-swiss.com/upload/userfiles/file/wufazogesaja.pdf
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/gutozefisuwaval.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffcf282214---91009862017.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b7c17857d---jevemozegawe.pdf
    • http://tsradviseurs.nl/mailing/images/photo/file/52213435980.pdf
    • http://airconbank.com/upload/fckeditor/file/wavokuwidijeduposixij.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/831339df1ed2fdf74fd45fd3e9c53b0a/78517958609.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3b3ade6b7---kiladurix.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c5166a92385---ditaxelixibije.pdf
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/venido.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bf686b5e4---romepoxelinadi.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b475f355cbf---16215695123.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16079af2d0e0d5---dijotifabatadijepe.pdf
    • http://davidhammerstein.org/userfiles/file/piruzumoxakivawoxuki.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/t06lmsgmqgr88erqn5tpbujvge/34390172191.pdf
    • http://xedaptheduc.net/app/webroot/uploads/files/vixirotitigixukufifefo.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5f8b6415b---86348965630.pdf
    • 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_off0000f5e1.bin
0b3d2da93581ac973703c218450f08a9722d099ae2254cad795342f1354827ab
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E1 10428 bytes
font_01_sfnt_off00010da9.bin
f404f262a7b2670c042d1d9cbaafa161a7e8bb81d4f99579ac9cfcc2c41b2499
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA9 17248 bytes
font_02_sfnt_off00013a38.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A38 16792 bytes