Malicious PDF — malware analysis report

Static analysis result for SHA-256 520021a1f3187ad4…

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 20:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f40f88ac21573df8b82fe03163288c14 SHA-1: 82761219e429d38a9450a47989358981503ed5d9 SHA-256: 520021a1f3187ad4df5c6d33c1b3fea83f8af155e7c032a9ce8ccfa799fe9bdf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection or further malicious activity, contributing to the overall phishing or malware distribution goal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://crisismobile.com/ckfinder/userfiles/files/77232038934.pdf In PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/47896397358.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/29006541980.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161380afd0b928---4142482662.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/vagubakifitonuxitide.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/kupexejasezuvajukoxal.pdfIn PDF document text
    • https://turbooto.vn/upload/files/mekiza.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/xegobuxeguwulawitopexuko.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/xokak.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/37794385375.pdfIn PDF document text
    • http://leruichem.com/upload/files/pivesodefevoret.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/65575630986.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/pizeku.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/nurikikiw.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a14018f2b1---wasovitak.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210907174409297286b1fo0e.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aadb36b4faee8abb473c03e8306f259a/moraxofamixumezem.pdfIn PDF document text
    • http://flexa.cz/docs/file/4901454195.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/60843973172.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/fekexaxugapopekipivojorav.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f52235c57---32158320501.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec312a604d---kofabiwidinubomirokofo.pdfIn PDF document text
    • https://digireg.pl/upload/meximuxijosuvikumeboka.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/pafuputibajisesel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=graphing+calculator+pro+apkPDF 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_off0000d27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27D 19172 bytes
SHA-256: 51bfae2f064ba87502fec71a0e8d0dbd0cc69d6108167c2d8f53d59ee47ec248
font_01_sfnt_off000104a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A0 10584 bytes
SHA-256: e9af039164e30d24fae2caad690892c887d5b08a9b65cafc4cbeb3e5bc976127
font_02_sfnt_off00011cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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