Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f74901b3545360…

MALICIOUS

PDF

84.7 KB Created: 2021-09-13 19:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1a6cab979dee6d1213792445b97d6789 SHA-1: 4b888ea89fcb07b27e3f488b0e1f44ff06a033dd SHA-256: 18f74901b3545360213f867216e028d880446dcc6f4b605a8a4ef4fd53338c2e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or credential harvesting attempt. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://gruaszarate.com/ckfinder/userfiles/files/fidoze.pdf In PDF document text
    • http://harnettcountyhba.com/userfiles/file/58231996295.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161345ecfc86c6---zitifif.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/puegdckcdt23edaampmlrv3u91/powara.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613804c992823---vapojate.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/58187552206.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/59265740795.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/94420780936.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/wegoxuridubimirikojanu.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/12636d02d9cb17135b5c13b6b20b410b/gekapemovofoj.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/kuperagadufotuwojomusob.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/kudulunolaxa.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/vatifinetowudemusu.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/13679352853.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/367247454cab6525aed73a3fbd3bd91b/38829161320.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/fumodakak.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/25208748000.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/digixuvoxosemonabif.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/tumifekixabukivumigusewir.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/40905678468.pdfIn PDF document text
    • http://esistore.be/userfiles/file/3192415831.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/44407739594.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/magid.pdfIn PDF document text
    • https://datenglagi.com/contents/files/pebofo.pdfIn PDF document text
    • http://zamgph.com/uploads/file/092046523254.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=android+telefonu+h%C4%B1zland%C4%B1rmaPDF 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_off0000e58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58D 18616 bytes
SHA-256: be60fb689144415a047bd9b43cab27bbbb9a61caf9f9ab1cf72c59199c1a3444
font_01_sfnt_off00011331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11331 10640 bytes
SHA-256: 9001cf3aecc49ff4a480b5af1857f5677ca8cec5c43ea85241ac941ea81f8f99
font_02_sfnt_off00012b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1