Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa5d6a381b12d820…

MALICIOUS

PDF

83.1 KB Created: 2021-09-21 05:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 54620115dffb748c5a46bc1fcef52e10 SHA-1: 994d8ca577558c646e4091d728c77ea39ad3851e SHA-256: fa5d6a381b12d820d2615ef1209b08794329f6cecaf29e446dcd4e3549f675e8
164 Risk Score

Malware Insights

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

The sample is a PDF document containing embedded JavaScript and a significant number of external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The embedded JavaScript and the nature of the URLs suggest an attempt to redirect the user to malicious content, likely for phishing or malware delivery. The ClamAV detection and ML classifier further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nomylo.ru/uplcv?utm_term=grand+action+simulator+new+york+car+gang+mod+apk+download PDF link annotation
    • https://kemxoi.vn/app/webroot/files/images/pages/files/47163133565.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/dccb3617952e4123b1c8195e95e45274/zogasikewefugenuzuxelula.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/lulunugovazogikeduwap.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161454cc382bb4---bapekisadumet.pdfIn PDF document text
    • http://computerdoki.hu/user/file/vovokerukepaxiwugusosej.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaaf9d2269---31014821632.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/7md8gn42bstlh0686h0dpeedpp/wepajixel.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/rusoka.pdfIn PDF document text
    • http://esejsc.com/upload/files/lakiwuzi.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/16681260552.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/2942565058.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/82630609161.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/risesuz.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/59145678252.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/85497436522.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/vv9nt44mqi8tvsghuv2lftmu68/tasegoxabafegugegak.pdfIn PDF document text
    • https://ikansambel.com/contents/files/70488721302.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/jekud.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210917232155.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/zemunoditenipofepaba.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/nunezisogozomifaja.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/94367135662.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/fagijezizitu.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_off0000d807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD807 11288 bytes
SHA-256: 1fc134ae7814f83fa7421fb765ddfa07b2f00bb05c68131d536399b22b4115bf
font_01_sfnt_off0000f270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF270 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A82 19008 bytes
SHA-256: 5cf3d1dda3fdf4a37f92ee3e7292b4457c0a30b261e435a7364d23e09bac1ce1

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