Malicious PDF — malware analysis report

Static analysis result for SHA-256 b683856265f3136b…

MALICIOUS

PDF

82.2 KB Created: 2021-07-06 13:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03e19ea0d5c6d39a7296468012019f8b SHA-1: 96c02a43a1b5b18341081f948b35794bf483687d SHA-256: b683856265f3136bc58b60cd5a754d35d84cea876f51db5e977b848c0989af74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/2uaiidsq1h6eoovc2b81m8eq6h/gowivepobokipufu.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0df71c035---mepufidajevolijafow.pdf
    • http://hiddenforrest.net/clients/76790/File/miwixu.pdf
    • https://aashianarealty.com/file/83159287050.pdf
    • https://educationindiajournal.org/ckfinder/userfiles/files/91145198386.pdf
    • http://pumarecovery.com/userfiles/files/getiw.pdf
    • https://menlopark.com/wysiwygfiles/file/pulovisexamit.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf1aa8c4ea---pakifojagusipuwazokemuj.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/bbfe725b8d0f9c6eeb138915d02afd88/60641347370.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaa2194b84---70071054300.pdf
    • https://tenfci.org/userfiles/file/sufukusosavebofiku.pdf
    • http://vtvxm.vn/userfiles/file/78032971423.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2616855c70---rubogazapoz.pdf
    • https://ctapigroup3.com/contents//files/83824986388.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/e0328eb22f4accf20497db353a95ac2a/65506926813.pdf
    • https://churchofgodinjamaica.org/app/webroot/files/16855078662.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b83b1ce2f---rijelutobogujuned.pdf
    • http://daedukgs.com/admin/fckeditor/data/file/20210609102526.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/2857aa4192e1066bdaf1fda6dcda4b41/3100047780.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/543be2858de8355f780180cc01169a62/xinupawipimisazarokaxe.pdf
    • https://ms01bet.net/contents//files/91336729096.pdf
    • https://alihuata.com/userfiles/file/poxafiwe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=home+variable+windows+10
    • 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_off0000df7e.bin
e1257ad8fbf7c87a4299fd2ddb2c74f4a76eb3b078c2845503219249c1cbe73c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7E 10768 bytes
font_01_sfnt_off0000f836.bin
83157bbd9134eca66d4c032cabdbb33da7d9e8246928b22f39a31e246279ecf7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF836 16764 bytes
font_02_sfnt_off000123b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x123B2 16792 bytes