Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5637ebad7ec886…

MALICIOUS

PDF

91.7 KB Created: 2021-09-01 07:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 659e1fb4ee3bf8e8b370637cd44a85a9 SHA-1: 87793cf8c4744b0d99a6aab0b1cf0b1b6ae64a76 SHA-256: 1a5637ebad7ec88611ca18e9112839101f9cecf8dda9cf252a242e46b5a14142
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate it's part of a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute further malicious files or redirect to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://zhengfutz.com/v15/Upload/file/2021529162851993.pdf In PDF document text
    • http://birizgardenhotel.com/userfiles/file/lasotinevitupa.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/gonozuparuvamukufu.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/jatatafasukilakiwiparak.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/lubakefogaxesiwazakejoza.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///jijin.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/3a068ab973c8e0a4cdcf5e40e5fc9110/75317095036.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16283906979889.pdfIn PDF document text
    • http://snft.ro/media/file/68626862865.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/37804635121.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/vrcc7723a2qlcjn66nhb550810/38392520583.pdfIn PDF document text
    • https://scalper.ir/data/files/file/95928594326.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4151b6a08a0a6eea4cb2292454eaa671/tivonejeromiminujuvuz.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210508195946639.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/pisusifoderebimosizureza.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16075bdace806d---89284974376.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/mevefagibasubarutaxip.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b5581c35758---sobikujatomisizi.pdfIn PDF document text
    • http://monkeytailranchdonation.org/clients/e/e8/e82116dd0b5861b0917add2a69208af2/File/2888654291.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/9f2dac94865f475606ee5995125d1053/62558975523.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160871a63a59ec---14223857869.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/wavefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=customer+value+proposition+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_off0000fdfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11615 10856 bytes
SHA-256: 379ef6ab8272200ce1f70a2fd1f055ce94ee0b64fd46a07433ffab36059495ec
font_02_sfnt_off00012f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2C 19076 bytes
SHA-256: f52f206a85074a293f3ed0385dd6c7377e6ab831027da723484c56d27ec22340

Open this report in the interactive analyzer, or submit your own file for analysis.