Malicious PDF — malware analysis report

Static analysis result for SHA-256 2661b8d4207f421c…

MALICIOUS

PDF

85.7 KB Created: 2021-09-14 19:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 227bb7a3591af01f3cedc653b4929859 SHA-1: d566bcba8d52f2d36a5b8f1be8716bfcfd92a169 SHA-256: 2661b8d4207f421c797f093fa0dbd14517fd79419c118b6c7a2ead50b6a05fcf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://coretry.ru/uplcv?utm_term=pixaloop+pro+mod+apk+latest+version+2020 PDF link annotation
    • https://floraplant.gr/FCKeditor/userimages/file/dijutamefedixa.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/70796357008.pdfIn PDF document text
    • https://matricula.arendic.cl/files/55656021395.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/91231366193.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/49195522432.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/kawowezufovaxet.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161322f62ce61f---towobuwulirawojabavox.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/71244656779.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/1a92ac9472f7dafb020dec5b727183e6/juxutibajixekovamamikumok.pdfIn PDF document text
    • http://coumert.com/images/file/33190117093.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132d028a67dc---xuvamizoxifodapapegikowa.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/81699169433.pdfIn PDF document text
    • http://topoint.net/userfiles/fckFile/20210914004707.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/loxus.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/wojuxisevadufepidede.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/1790063510.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/8e06fc27a960609fbacc85eb79bece23/24900342348.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/nivur.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/lokoramiz.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/006a859fdbe82339da2207ca76b7600f/gesejeturotapoba.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/bafeferag.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/55834661659.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/wusagefofige.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/89549930164.pdfIn PDF document text
    • http://nemalipics.com/49287564701.pdfIn PDF document text
    • 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_off0000e75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75D 18012 bytes
SHA-256: 941cbfee606b9fed6fc46e295080b697b848c66b352c82c0ad7cc6214aaf579d
font_01_sfnt_off000116c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED7 11056 bytes
SHA-256: 9e06d6123295bd7e5bcad9df2489051c69834f9b9f91f0ed37e0d18eb78de2ea

Open this report in the interactive analyzer, or submit your own file for analysis.