Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8df923cd0bf1a2b…

MALICIOUS

PDF

73.1 KB Created: 2021-08-21 04:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5553c0564eb92000745ac63cf5da65d9 SHA-1: 4bff5299d5cede76c1057501450827b58dc04bc1 SHA-256: a8df923cd0bf1a2b5abe820680638c895e014d491b463054a594bbce8dedbb83
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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=fundamentals+of+financial+accounting+phillips+pdf PDF link annotation
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3a9a0bea9---31214162448.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/78936494604.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/6d1c488b622f7c77ae9a90c32af01304/fifonobosuku.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/18711500161.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/84542403864.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b1f6147fc---13052830552.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/bebujajuwuberapamima.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210708022617.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/0d26440811be5d94627fe83a04ef850a/15691683592.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/f8745f79c78e39356b7e813c80fcd2ea/lekazabirokon.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/fixuwiwavap.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/btp2qprhejat5hcqglccdm8oh5/mumafitulalejedamugi.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/99ba7a1c9039aed036ebfe40cd539689/43597157599.pdfIn PDF document text
    • http://monroe74.com/clients/871877/File/86952645967.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/rarumuvutizud.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/f22423edb5a4b35c12a59a1dfbf1fc87/fekabilisanozu.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/31739925197.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/letoz.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/tmes1trec8kv3lo77uu5g7i5ch/fumurulisa.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/2298319872.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/kuvuzukoruwobodexutizu.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/tudigewoto.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/a31cd51720f5f36d1c7f4ce8f83132f4/namipuvozijotes.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/73236782268.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_off0000bb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36B 11044 bytes
SHA-256: 50d370a6df08bdf4f70f57cdc0db46d45af94b64a4c702a99542d7e51955241f
font_02_sfnt_off0000ecb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB1 15776 bytes
SHA-256: ad2788a4190898466cecc4fddde938a1dd08b15bb45e2022c5aae9cd9789ff07

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