Malicious PDF — malware analysis report

Static analysis result for SHA-256 e733fe68febf94ac…

MALICIOUS

PDF

73.9 KB Created: 2021-09-04 10:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 13f372ec07eda564183f323a4994cfd4 SHA-1: 4d5d1f8db07030858adb96156750f7eb8a5cd337 SHA-256: e733fe68febf94ac58c5659eefa9c266aa0ace4c618acbdceedcf110ef6f8224
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous embedded URLs that point to other PDF files hosted on various websites, some of which appear to be compromised CMS uploads. The primary purpose seems to be directing users to external content, potentially for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • 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://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/923a8eaab94a4cb3c70809f1fa68325c/85431925053.pdf In PDF document text
    • https://bushregenerators.net/userfiles/files/18512808557.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/26878276456.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b12ebc6aa5a---towuwalejebezuvonapuga.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/bbc000aed31087a09ddaaae93269264e/1176655896.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/20399885929.pdfIn PDF document text
    • https://anjingliar.com/contents//files/23543606033.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/d83d05174413ca99dbefb4e21c4f980f/49608956361.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/94365358599.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/lufumimotuvajonezes.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076f045edc3e---mamumafugedenu.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/5929334462.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/fijetugufusetifem.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/jakopenadugixezi.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/22049028938.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/gasafo.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/91bba43b4ad9e7f00fb98d015aa554d5/jolinezedexor.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/rijoretazizipobivel.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086fce9c3e8b---nesivijekekisozutelije.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/vowupimi.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/c695f90ec2502c7b0dad69c9074a971a/bedizar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=believer+piano+music+pdfPDF 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_off0000bd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD46 16984 bytes
SHA-256: 12e8d0e451aa65784d261e66ce1699966733f92dd10af4fe05e01a2fbad23239
font_01_sfnt_off0000e94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94A 10904 bytes
SHA-256: f0ca996da65b9acf9f140c89e1493d1c9a56a15d9c74266687ca622093fe3db1
font_02_sfnt_off0001027f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1