Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d21aaec6311081…

MALICIOUS

PDF

84.6 KB Created: 2021-06-12 22:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6034be81112a376f63d710542f6c06c SHA-1: a48170a2b1b2981c88b48923df86cc90c238dcb3 SHA-256: 82d21aaec631108124655c1d96add5e611756a403b31cbffd168d025a4223099
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm hosted on compromised WordPress sites, masquerading as a guide to download Fortnite on an iPhone. This suggests a phishing or malware distribution scheme, likely using the embedded links to redirect users to malicious content or exploit kits. No scripts were extracted, but the PDF structure and embedded URIs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crysiq.ru/uplcv?utm_term=how+to+download+fortnite+on+iphone+2021
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a2872c7a1---kalemo.pdf
    • http://hopkinshigh1988.com/clients/75739/File/wumujufidejebewawo.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d7b32abb3---63235143478.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160750f68e85e7---43056095102.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981f2eaf415---26943332954.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7db4585f5---ruvowikaruje.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/7218bbe9a4c538b3d98385030a6ac628/gexisejufikawilelufeni.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfadb23a38---22737771576.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160797800aac29---jijebesixaduvirisijurozi.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2729e08e1---96595343307.pdf
    • http://littlepearlbooks.in/data/eimages/file/rapavepupagi.pdf
    • http://lab4050.com/upload/editor/file/sefileku.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b638d2a57---pilewinugibonagav.pdf
    • https://rybczewice.pl/userfiles/file/xutimugufo.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%252Ffile/vitimepamamibepedojoga.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d4c.bin
b124a86c37ea1b42800c7abed07d6f016da35c05432c7966e7f096cc4f72e5b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4C 5328 bytes
font_01_sfnt_off00011f7e.bin
c70cf24b22882bd69da709722e480c1b27504ffd34b5cb4a6b4b332be66a1cd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7E 11032 bytes

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