Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c29ea84be3e5081…

MALICIOUS

PDF

71.5 KB Created: 2021-05-30 06:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40743fc3124447a16ff06963b3cec596 SHA-1: 3f0d447faf29a4ed427783011b7ad5b4d8b29ecc SHA-256: 2c29ea84be3e508111dd599669c7c4d24b73b1ad643e7497857640bffbc967f7
164 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a link farm pointing to compromised WordPress sites, likely intended to host and distribute further malicious content. The document body, though heavily obfuscated, suggests a pretext of providing drivers, a common social engineering tactic to entice users to click on malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=acer+n1996+motherboard+drivers+for+windows+7
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c62ff283b3---66389595010.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/c08ce063fe235c36f822f3c1ddbf9af9/40926294379.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/39fea586903af9215c1a250bda5c975f/kuvoxefidepikuge.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/c9c59d962ae86c472f558cfa8005ec49/50573934726.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/qp3ibs501lq30umpu48qv0n91f/rodutamixirez.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e19c23c32b---88556879841.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/7840dffb76f87722a46a86d2dd27ea28/94227489299.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/30863719b73ae33afa159850a3efa564/potidiwate.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/109b139437efdcdfbc1d14ac78def62b/63332462910.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a8481d89233---juriboxizukojimetabaser.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c88bb053a6---28112129703.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c754fd2378---49511604644.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c73e6f0064---68942143273.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098412d05c2c---geperivuberi.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c182b28ca---xunuxebori.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072cf2356ea8---zagivifedugunurazuzexofer.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_off0000d628.bin
b44b5b9bb67016c4b93653a919e459a89ce7d18049a78f233ae26ee74e0d10fe
pdf-font-stream PDF embedded font (sfnt) at offset 0xD628 5952 bytes
font_01_sfnt_off0000ea5e.bin
5204858f84e4d8e2745729d4c07a446392bc44abc0111b7b1a3644f049473434
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5E 10844 bytes