Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e88b2c76fcdb33…

MALICIOUS

PDF

74.3 KB Created: 2021-09-10 00:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 42e5ae2dfa1d99dc35c9f4c292d3cfba SHA-1: b9a50c145c385a7a670b6db1fb1930dded180811 SHA-256: d4e88b2c76fcdb33c72cd6aa4464112f6b33849a107e621f349146e4bc934b58
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains. The 'SE_MFA_LURE' heuristic strongly suggests the document's purpose is to trick users into providing authentication credentials or MFA codes. While no scripts were explicitly extracted, the presence of PDF links and the ML classifier's high confidence indicate a malicious phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://archism.ru/uplcv?utm_term=aelay+movie+ott PDF link annotation
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/welejaxifelabufilalazapi.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/gerasawisogirupojovu.pdfIn PDF document text
    • http://santabruna.cl/upload/file/71643243292.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/8d2aeb28dc3b32394a5763c83ec4d895/sexoxerimuz.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/pepozitoruwitafijuko.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109030747593589.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/vukojomodar.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/83430618667.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/rilizotedidezepavovulore.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/xazudikelo.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/taradawesuzuburiw.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95767183009.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/bubovareximemuwenisewasa.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/62314602899.pdfIn PDF document text
    • http://scsytech.com/upload/files/69669108405.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/digojujazojazukuzizenuru.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a69e3bfe4---80946539492.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613859d60745f---dovetafuru.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348b55d6940---mefawajugow.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/38565771643.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/jukaxidezegapuliwefutizip.pdfIn PDF document text
    • http://krzeptowski.pl/file/70580060450.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-6/20210906012745566742.pdfIn PDF document text
    • 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_off0000c251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC251 10060 bytes
SHA-256: 0d4412206b10ba08516ffb658a9aefc28d6eaae7d911ef5e0820123a197e00a8
font_01_sfnt_off0000d8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B9 16676 bytes
SHA-256: 10df1c88818fb0c77b10bd2981e29f7d04b8408d2a33fec177c5230fde75f935
font_02_sfnt_off00010426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10426 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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