Malicious PDF — malware analysis report

Static analysis result for SHA-256 790e5d21c58dce97…

MALICIOUS

PDF

89.7 KB Created: 2021-08-08 00:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a8a4dec713d10e12ab4c9909ffb0885f SHA-1: 62cd0c89e446bf9afa0c1437a9687daad8088363 SHA-256: 790e5d21c58dce97b1e8fd21bef81b1e3bd6f0315f53884401d525de9e4e0abc
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded JavaScript is a common method for initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9884

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://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/22196510876.pdf In PDF document text
    • http://thrifty-uy.com/files/others/30202262086.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/6e1b86549b39e73f23cc8038f3d6cb38/zuwawoginugebawi.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109f88b46532---39105531694.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2b945e936---4082607702.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/63455076630.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/pekoxifidesitamusezol.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/kilubevifafunipokux.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f514c59a9f5---lusaxovuwusekavu.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/2ld3jo5ttr9tv35kg91advem3p/xikifekegorajelavibamuxer.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cef4de1dc5e---18541958305.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16079011c525b6---gemafesozuju.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/eadff73c498db08e6edbf20d96a7c49d/20807077129.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/84375000136.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/78163435785.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/nizen.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/noruv.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/zunafaditijorimivu.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/wupusodeju.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/mezaze.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/06a513c43ea4548b3065ca1dcac03b55/5497710066.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a59d410646---34550080490.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/legaleko.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/v53hcciropt84bd43sf03023tj/98508249674.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/a99d2033eb1557d0c7c8d0ba3f610c78/zufexozopetosedurasoweji.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/39304114546.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=ravenfield+beta+6+free+download+windowsPDF 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_off0000f8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EA 10852 bytes
SHA-256: 768847699090384b1eafa9ae80990e61ea70b15ad80ea20262e703e9fc7a5c08
font_01_sfnt_off0001122f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A41 17268 bytes
SHA-256: 99ff171c8a009654eaef38f606bee494c1273aa60979d7abc847c5a6d1821ebc

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