Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6c035e46346b24…

MALICIOUS

PDF

87.3 KB Created: 2021-09-18 10:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 78d445b5a18a36abc1c5e9b89dbda5cc SHA-1: f030e33311aeb381d46b43d9cc4878c62a382448 SHA-256: 4f6c035e46346b24027ae28d7b4f9e33d2dab4668129a02c13cb7c469e5f8933
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document's primary purpose is to trick the user into installing a fake browser update or extension, which is a common method for delivering malware or stealing credentials. The presence of numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, further supports this phishing and malware distribution vector. No scripts were extracted from this sample, but the overall structure and heuristics point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://jungleflightchiangmai.com/Uploads/files/jurarupabadaze.pdf In PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425b3ebfe0b---95403888283.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/71523172777.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/57532062249.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137dd265d526---37854873859.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614511560b819---53504738625.pdfIn PDF document text
    • http://taociren.com/upload/file/210909021319072001xpjb33fbz403.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/32753833790.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/86542209051.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/tebepoxuzikin.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/28240747297.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/85988703427.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/nupokifabavomigusegirir.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/61217870032.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/89892490992.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6fb8a6ed1---gekinati.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/dunikowiwaru.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/84068320305.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/vasebanawex.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/43440123159.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/dumeleladexixez.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161340f2e9ef2b---mimiwivij.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/60905515401.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/deguroxubiwol.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/ruzuropobadenobupakunev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=panel+app+download+apkPDF 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_off0000f1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B0 18332 bytes
SHA-256: c124b157fc3bca79c27520dc2737b74e0a119f4dbc91fa98833d1480a1b0fb61
font_01_sfnt_off000120bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D6 10108 bytes
SHA-256: 3bc122bbb8e32a88331b859534f3fd182d715a237a69026910a98662383f51f8

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