Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dbb2bf49fc04b64…

MALICIOUS

PDF

79.4 KB Created: 2021-09-17 07:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2b7081de7f2fbe97f1fca9ae9c4f2d54 SHA-1: 8f0cff30381c70c6cc2ea8b10df9538a1e571928 SHA-256: 7dbb2bf49fc04b641ab0f5b8e7146cfaa27d6fdc5cb6229c9a337a08598d63aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ce74c656ffc3364049fb752b320aa2c/20473041459.pdf In PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f3a2b473b---44033209416.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614151d18829f---dorizasebelegixevagil.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/topagofixozipa.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/57840694186.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161410d9b20bc2---2802173605.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/zorutufadem.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/4052455300.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/nagonexibopabolori.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/79716645044.pdfIn PDF document text
    • http://jswenguang.com/uploadfile/file/22177334564.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/49033603649.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/37103225500.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/52104220606.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/17131600943.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/xexusazo.pdfIn PDF document text
    • http://ebus.cn/up_file/file/jukatiseweroja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=videoder+download+apk+2020PDF 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_off0000d31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31A 10508 bytes
SHA-256: 78bac2a014f889b944cb2b79e5b80c348db25f30b27441c08ddfb052838c6afe
font_01_sfnt_off0000eb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1A 17672 bytes
SHA-256: 7bf28682731491064051012d7c86d23279f6739f3166144a680fb59b10bfa1cb
font_02_sfnt_off000118bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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