Malicious PDF — malware analysis report

Static analysis result for SHA-256 25dd3929188e662d…

MALICIOUS

PDF

81.0 KB Created: 2021-11-13 08:49:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ccfba3aa2aa8368db1cf54a32674680e SHA-1: 7a90885d48ed61b6bcd57a6dd302d865435a927f SHA-256: 25dd3929188e662d02f8b9408bc28ff0c7ae53b3df19565f5f10d6e4f503f136
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to obfuscate the malicious links or perform actions upon opening.

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 https://catamma.ru/uplcv?utm_term=marquis+of+clanricarde PDF link annotation
    • http://www.frank-diagn.hu/userfiles/files/31471960755.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/wubifuvaxaxilivimiduravi.pdfIn PDF document text
    • https://signika.pl/Upload/file/jezatogajajek.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/sanowojidijo.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/jigikuxetapomeded.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/wikorafiligadude.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/wavofosorev.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/zetorefu.pdfIn PDF document text
    • http://hidropro.hu/upload/menimanixapedid.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/mefogorotowigeg.pdfIn PDF document text
    • https://cristalensi.com/public/File/67555632572.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/fukumibokogi.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616ada9874050---37112847364.pdfIn PDF document text
    • https://angkalaris.com/contents/files/66827498015.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/vijebo.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/xawukesuzezifozukaxu.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/timopemixexaxasuw.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/64715945302.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-05-08-58-09-24.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/51648960561.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/sapifutefudozaliwiwani.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16149cdc46b46b---fixizekaroja.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/4bdd88c3f47c1e0507cab0c4b2a1eb0f/11392321876.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/sezujunukawuvebif.pdfIn PDF document text
    • http://centrons.com/uploaded/file/9446271286163b63f3383a.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_off0000d4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C1 10612 bytes
SHA-256: e2cc364ffbc38fadd7a5fabd8f40955d660b2477a5406b11ddfedfa14f8ff376
font_01_sfnt_off0000ece4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE4 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_02_sfnt_off00010405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10405 19084 bytes
SHA-256: 7dc2aae7eab4b5c0f919a5253595ea6a2ade4008a6afd0ec7709e97e3afa2503

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