Malicious PDF — malware analysis report

Static analysis result for SHA-256 ded4ba2c01a6ca77…

MALICIOUS

PDF

81.5 KB Created: 2021-09-07 13:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 326f46502d3b615bb04511209a05e6cb SHA-1: a5b87162ac57ffbc425d329d83bc3c456643776c SHA-256: ded4ba2c01a6ca77b109f85bcbe7c0e8f11b4f3aada8cd10d080a3cd7ea759db
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs, many of which point to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://asea-admin.com/_userfiles/file/20210810195604.pdf In PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/53588122797.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/2275409404.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/pisebofenewajovu.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0f9630977---lobejunosovobafep.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/34654904602.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9b7175fb2---wuguwazowite.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/11468426716.pdfIn PDF document text
    • http://sns.hu/_user/file/33213109549.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/sanareru.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/pemekunuzasobugelodudug.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/libizerawepugijufop.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd74965fdf2---36859269466.pdfIn PDF document text
    • https://luminex.pl/upload/file/fogisoz.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/jefiwusuzo.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/51627369689.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/8db3o4fjc6938cm95v9hppesom/76849428092.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/b4e06ea84fc001cb2fe854b43b5ca1b1/womolu.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/dotilugatawoxarin.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/lapiwixuminir.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/50232527838.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/23191227789.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2ac89e11e---xuwuro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+gospel+of+wealth+free+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_off0000d63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4E 18884 bytes
SHA-256: de62b4978c721112abc3de526ef8ffad17128abb982a2dcc80375706821a0ebe
font_02_sfnt_off00011fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD1 10632 bytes
SHA-256: d47f50423ac0aeab6fb93c634c188dbf4e16da9629f01c5d0c8dbfa15c0971cc

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