Malicious PDF — malware analysis report

Static analysis result for SHA-256 46f7c3e66c75aac6…

MALICIOUS

PDF

91.5 KB Created: 2021-07-26 02:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 52b4e1dfdecfdf25f261bf7ac866e694 SHA-1: f758a17b678876756f192543b7f6806a2ed71d38 SHA-256: 46f7c3e66c75aac6c49cfe162c7a0db56a3ca1f9ff6413aa0ed128ca21f29afa
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 PDF documents. It also functions as a link farm, directing users to multiple compromised websites. The combination of these elements strongly suggests an intent to phish for credentials or deliver further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e288274a0a---fibemebibewafe.pdf In PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/47940466194.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afbd0a2ea3---21489664892.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/b91d90ada0106ba0eabddb411e1f0ec6/nipeliniw.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/72600103886.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/74637653512.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/c4bca395828c2f55a6b04436af1d4e24/gepevuwukibow.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c52bbdbe8---518956103.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/vivap.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/7f3b19d40c57fdb88359cd32638cef7e/72148690906.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/70592862355.pdfIn PDF document text
    • https://aashianarealty.com/file/37865981403.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/wifenagewofo.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/21783082586.pdfIn PDF document text
    • http://aimic.com/userfiles/file/50775072174.pdfIn PDF document text
    • https://deepex.hu/hirek/files/11128820224.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210605105423.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e15b387ab9---87738196674.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/1143512530.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765cfc060e9---57386684991.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/lofavovinapo.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/d56c153aea48256dfbfed3a84965363e/85272478527.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/65285009546.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=is+the+demon+in+asta+goodPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10B 10500 bytes
SHA-256: 6689736d8312e2f9f4183fa2f7d704933a808a9b09e08e8d423d9c4f9cbfa6b5
font_01_sfnt_off0001088b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001209d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209D 19348 bytes
SHA-256: 12293d93bda3f551c741449b7f9e16f497753dd7cc168aaca9fc25607e8740e0
font_03_sfnt_off0001517d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1517D 3620 bytes
SHA-256: cb0e5013f897d424912b641c5da6ce39c08dd98383f4055cb12010a06aa4f07d

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