Malicious PDF — malware analysis report

Static analysis result for SHA-256 b53a574dc4b62a98…

MALICIOUS

PDF

71.0 KB Created: 2021-10-03 14:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: daab6f71c924255353e5e1e5dbaede37 SHA-1: 1eeefe2d16d0be2ddd009ccb152b4dc813ae86b7 SHA-256: b53a574dc4b62a989ef93eb078b8b5bcd15de260e26836e940eadd6bd2b7b25f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to disposable hosting or compromised CMS uploads. This suggests the document is designed to act as a link farm, likely redirecting users to phishing pages or malware download sites. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://philabc.ru/uplcv?utm_term=stroud%27s+digest+on+the+diseases+of+birds+pdf PDF link annotation
    • https://vietnaminsight.biz/ckfinder/userfiles/files/nexaxenugefeluvugizubin.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/58994274417.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/91040230154.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/xefulisokezotan.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/ae611898b23599116de235ac3d88bbbf/tebazuxuxunaxopol.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/43358291031.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dd3d7ddcc3---12699839360.pdfIn PDF document text
    • https://codefon2.solar-napkollektor.hu/js/ckfinder/userfiles/files/rufoxugijaxitixevogujegel.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147bf4cdc2bb---taladapu.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/6560357630.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/batejagoxulekuxopaga.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/gukomiso.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/98000360756.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/54751708845.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/63183836234.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/wutunejarivax.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/pubiduxukozevodudu.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fce7836ef6---66617829274.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/70407481238.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/rerilagusumenutalirex.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/53680886477.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/jomulaxexoge.pdfIn PDF document text
    • 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_off0000b194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB194 11080 bytes
SHA-256: d07bf957be946daf48e79ebad0ccac7dd77e26a9092aaf16ebd5bfa6c9437fe5
font_01_sfnt_off0000caf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE302 16724 bytes
SHA-256: 01ffe7ef0dd921326107a532d50d5c185eca2dd8f5eb85ec97ea901d8e1c9e19

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