Malicious PDF — malware analysis report

Static analysis result for SHA-256 79876d37718bbab0…

MALICIOUS

PDF

73.7 KB Created: 2021-09-17 09:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eba26bffe6ba63478423d12f422b79e6 SHA-1: 6b34c0b758ae9e41abd451495d2b39107535da7c SHA-256: 79876d37718bbab028edf0dcecd92c81871af38f8d19dcac5f40aa1720adf599
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to download files from compromised CMS uploads and disposable hosting. While no scripts were directly extracted, the presence of external URIs and the nature of the heuristics suggest an attempt to deliver a payload, likely through a malicious attachment or a link leading to a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://fortworthdental.net/cmsCart/upload/file/51002684358.pdf In PDF document text
    • http://nanumed.ro/uploads/files/bubudazujizipidudafoza.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/75522927418.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/23897542913.pdfIn PDF document text
    • http://rhondachem.com/d/files/77308038925.pdfIn PDF document text
    • http://state-lithium.com/upload/files/bomidogoramimego.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/47a1eae1e2da6a8cc6956c644ca1f9f8/bigiferetefa.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/tekumuvinuwajedafumoge.pdfIn PDF document text
    • http://skalamatbaa.com/userfiles/file/35287407990.pdfIn PDF document text
    • https://spyboarcams.com/files/piradifa.pdfIn PDF document text
    • http://sdds.be/userfiles/file/97105777392.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/terapopopuf.pdfIn PDF document text
    • https://andhimazhai.com/images/files/52183296580.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16134ab5dd9212---91427304898.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/58500466750.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/fufezarobojelipexuzab.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/916ac866a731bc56b723b143138c5703/zuzumakamuvowunemagadade.pdfIn PDF document text
    • http://showdoimovel.com/files/files/72868086387.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/solagolajazebavatakuf.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/lejimexuturotexesadiw.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/82666914496.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/80889348855.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/dafepugekiwow.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/piluvojolugejuvine.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=beamng+drive+tablet+downloadPDF 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_off0000bb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB02 10768 bytes
SHA-256: 3253fa47d935f18563ec420775838544f29a863848436ce41a1822f9771501d6
font_01_sfnt_off0000d390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD390 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA2 17000 bytes
SHA-256: c9a52bbadb85b31d3c4e53354e52ab81dc2f4e5a96c601b7411dfa0929e69e8c