Malicious PDF — malware analysis report

Static analysis result for SHA-256 3924e657416d2ad6…

MALICIOUS

PDF

210.4 KB Created: 2021-07-04 01:33:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6234a8d3ab784b79232b81e7b6aa72c5 SHA-1: 95612c0a6d2a44b51bcd61fbf0b74a9272632d72 SHA-256: 3924e657416d2ad6e2a2422aa191e1d09067e058df939dfe39228c0b845608a4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, with at least one pointing to a compromised WordPress upload directory, suggesting it's part of a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the compromised CMS upload link farm strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 5

  • 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.
  • 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://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/291f5c51beaefe8e3e505b666e87c037/36455850724.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/qgiq5m7su6oqab5t8buijb3rl1/45378944710.pdf
    • https://tidaksusah.com/contents//files/80088751283.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/b27043bae8be974c307f92547a76c1ed/25543397370.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160952fc5593c8---25340555134.pdf
    • http://accesoriosalmayor.com/images/userfiles/file/76198977641.pdf
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/pavowozamonijipuja.pdf
    • http://chroscina.com/userfiles/file/ralunebev.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34d813fe8---59964423697.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/lj8tbk3jbns90tiaoo9ekpk4j3/poseparum.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731ab2c94a6---49230295977.pdf
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210630063624.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/6cevqr3227936b32fvldj4vco0/50274469241.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/7da0a228a1c78c6dfd7783f2ab109860/1936651583.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/3gdp7fehp9pdkp86dstuc61ta0/meredoziporogexazit.pdf
    • http://crm333.com/documentos/file/87277196400.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2d6b6d52a5a5318856efe84cc48dabde/50989348496.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d28a35240---70529989690.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/8106697265cd1b37242a3f6186b294cd/16061820220.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/82b1e8bbc6c9f1566f7303d05cf43a51/42131683675.pdf
    • http://perfekttorun.pl/pliki/19599805907.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=3+types+of+righteousness
    • 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_off0002dbb9.bin
f37e73f059bd2f5291f222ad90efe843af89a5d0782eb59955b3608ffcf9f874		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2DBB9 17648 bytes
font_01_sfnt_off000309b4.bin
b9348cb9d025ad1c5ec37998c74ab99e145fabbc478464e57e41115d469380fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x309B4 10720 bytes
font_02_sfnt_off0003224f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3224F 16792 bytes

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