Malicious PDF — malware analysis report

Static analysis result for SHA-256 9add86a55481dd80…

MALICIOUS

PDF

70.1 KB Created: 2021-06-05 03:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a594cc6f9e91ed2d515e7f9a0e39bf1f SHA-1: 3f63573793dc236f9d85db248150c52d4f300b59 SHA-256: 9add86a55481dd809d885550105a446b5e078006de36336458d7fc678e72b7d7
156 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML and ClamAV, indicating a high probability of malicious intent. It functions as a link farm, directing users to various compromised WordPress sites and potentially malicious URLs, disguised as a search result for 'Pirates of the Caribbean DVD player'. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nomylo.ru/uplcv?utm_term=pirates+of+the+caribbean+dvd+player
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/1203b18ad31b9e4a7b5dce4e0929c8ee/xeduwogakoxo.pdf
    • http://firanywiktoria.pl/uploads/editor/file/87968626153.pdf
    • http://voxel-avocats.fr/uploads/file/goxipekufup.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/9f91425767feccdd90ccca70cf8eaf94/28569729140.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9688566608---26370842135.pdf
    • http://accessprecision.com/userfiles/file/11375642582.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/a03f68fdec9e3e94ea814cda3637fd44/regeb.pdf
    • http://castrolmintabolt.hu/images/upload/file/86680517648.pdf
    • https://balaji-technology.com/userfiles/file/99752244396.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/p9scdt6dfi8h9na3mgeh9p6s2e/59438924612.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6a51b0589---27043943973.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073eab657710---36870156557.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/7611e27e539768ee8a6f442cf1032944/91975945783.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/jiuk1bt3d30ep42u5glqiigh97/nusovovorubag.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078697bbefe2---xulitedupubufanofapaxigeb.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/8838ddda335e2bb681e9988d3064ddfd/38995778308.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_off0000d544.bin
db495b7b0bdec8006c54eda4714b0e343dfa50926a914271dc971cb1840380d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD544 5548 bytes
font_01_sfnt_off0000e81f.bin
87154209d6abc694534184945649ecf1eeb9de2e0baa72d2b068fc69e0694c43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE81F 10392 bytes

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