Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcabcc20cc618f05…

MALICIOUS

PDF

84.9 KB Created: 2021-09-24 07:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aee2e6647ffa495dd527e0e5583f1784 SHA-1: 60a488b928d721c5b951929875ef8879f209b43b SHA-256: dcabcc20cc618f056813499a0cea15866ad49341f6e1bc481418aa80370c282a
164 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external links, many pointing to compromised or disposable hosting, suggests a phishing or redirection scheme. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fenixfalt.com/userfiles/file/31630852007.pdf In PDF document text
    • http://haohanlegend.com/Uploadfiles/files/4399326317.pdfIn PDF document text
    • http://maxbrio.kr/files/files/sizigaxozinivokivajati.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/47659432387.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/565341435.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/33287524946.pdfIn PDF document text
    • http://canadianrockies.info/files/file/gojifedidazotubu.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/mowokiruvofifojuj.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/50163294548.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/javomamatogagopid.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/lirutepawux.pdfIn PDF document text
    • http://findusafranchise.com/files/files/jujativulilupuxixo.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/mufovupewasoguxasike.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/xowazivozovabijoreje.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/46648091477.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/9050d576445e8aa1279db3be5f566c4b/27426905637.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/70859671535.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/bovuw.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/c2314ee00a8c0112c1e99f5e8cc07d4f/towezoge.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/b4bbf564b7666e1bec3ca8155b568aee/32435977950.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/6302504923.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/xujulefibuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+get+filelinked+on+android+phonePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF53 10780 bytes
SHA-256: 88dd109f10c9191bc3bcc573e46c4dd068f20a9438faadfe1bc3e0805b0e2b42
font_02_sfnt_off000117d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D3 17620 bytes
SHA-256: 3617e122a73e786da03a1cb82da2ba0b9031dbe2bee131c1aa5e43d87b93b3c5