Malicious PDF — malware analysis report

Static analysis result for SHA-256 35192cd643252e18…

MALICIOUS

PDF

78.0 KB Created: 2021-09-13 12:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 52a3d01d8edfb92353c161d508045b64 SHA-1: 98c569da3d3c09a6c54a3ec0e19c4a6e6654281d SHA-256: 35192cd643252e18c1a8541a6d1efb70ac8d41fe65c60605e1dd70bf45e56c10
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL targets suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f601b8cef---linigururute.pdf In PDF document text
    • https://bravo-hk.com/userfiles/file/87148310815.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/97503625245.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/weluputiwemizevuvag.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/7825991310.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/tewuxin.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/44316641623.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/lokerovudefised.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/joresowovomevajigosoro.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/57346814370.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210901174640.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161374e7e18b97---84100921494.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/zapurajutonalezuruze.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/89310731130.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/jivanesap.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6bfec1ca3---97482251607.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/xepomepuwazugumum.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/83944203221.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/9ac35d2bd8493a614d76d3e9264df43f/20395053325.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/fuvadezadexiputorix.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/dololoxamaseloweberiboxi.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/13993480650.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/90922092727.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/senil.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/rokosowef.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/77835175696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=sum+of+convergent+series+calculatorPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7DA 10920 bytes
SHA-256: a7b0e340e3d097173a85ea6321708f4f3dbbe7382311ddecef8e662b2fb302c0
font_01_sfnt_off0000d128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD128 15376 bytes
SHA-256: 7ebc6ba73de022ca203605f3b5b067e1c8f1d9c02c45e20c1bc61e426a0a055e
font_02_sfnt_off0000f813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF813 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11024 17192 bytes
SHA-256: 2e4504b280c77841b83e6dc05cfa7d952844e781cf83b00604b4d078bbbabfec

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