Malicious PDF — malware analysis report

Static analysis result for SHA-256 c882a00c4f4dd65b…

MALICIOUS

PDF

71.1 KB Created: 2021-06-10 17:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a457a38a6475ba95a4e8ca79c09ebbf8 SHA-1: ad748952561404c50b95e6e3963964a7db1ebc03 SHA-256: c882a00c4f4dd65bcc916299f0bf8d9b81422f6084a8561ac1d5786204c87bfd
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious sites, likely for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://allytemp.ru/uplcv?utm_term=dark+theme+android+studio
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160861710c1573---43154663120.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/b53be0ba48bea2d2a1b3908ebb8520aa/42406459093.pdf
    • https://diedacorporation.net/freesiafiles/file/16264620404.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/1e6ae4170b6f6abe82ad88cf3659079d/46615562412.pdf
    • http://fitviewer.biz/files/file/nikegexuzowufaveboz.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726b8e7309a---gakowopo.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/eelom5krp5pq8490pi760pfbn3/88718856767.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a150fab5978---55021018276.pdf
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/024678n9v99jmigf7tnsg8h9c0/satikuwidovimupikojurob.pdf
    • https://wfca-czech.cz/temp/userfiles/files/wovagemenuj.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62a4048202---55657524607.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/8695ec057f2027695edb54351830743c/sedupox.pdf
    • http://grawerlik.pl/userfiles/file/sutavepel.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b22a10108a1---jebiremumumozuwokeruxek.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_off0000d961.bin
298bada25b8c1ecfff3ef97575dfc93be60c24cec047ba99cc35a5966453a0c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD961 5096 bytes
font_01_sfnt_off0000ea8b.bin
cbf2d547e53ee6317073420da22d5bd97a1478f87d9edaa45090c2bc04318f4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8B 11352 bytes

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