Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d6e14a146147691…

MALICIOUS

PDF

87.2 KB Created: 2021-09-12 14:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b7887e9ee4361a1e44d85107a9214f7c SHA-1: 6c4f37ed74b41b55b2f951e668ecddfb3530debb SHA-256: 1d6e14a1461476914b5c39a6a7f50bb55eba26ff27bf8ec5e27bd456a341dac9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to multiple compromised websites and disposable hosting, suggesting an attempt to obscure the final destination or evade detection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 https://krisoc.ru/uplcv?utm_term=my+radar+apk PDF link annotation
    • http://huyndaicaudien.com/upload/files/19352790333.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/tunuxaresurimenovopapod.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/boweza.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/wurunimujarefuvekemor.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/samuzofeborelu.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/40141531238.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/20275509272.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/kuxed.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/veledo.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/22541848910.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133413865368---lijulizoxanu.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/23298812387.pdfIn PDF document text
    • http://cichanski.com/Upload/file/71484821959.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/birapabizob.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/mixovusunowopaxuzami.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/34333712567.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9c5946fd1---30549221498.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/zubikopegubabanufan.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/fd81365387fb6cbf430c6b445160ad28/zipilepujedelojerugupaj.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/17559368939.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/ludifepug.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/mopowokiroweg.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/40231263009.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/dumubodemoz.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136352916ee1---nulaxovigarad.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4D 17704 bytes
SHA-256: 61df8438c4c56911f10549ceb4ae55de75d45f3cd8787c9ce725dfeff9865865
font_01_sfnt_off00010ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB6 9824 bytes
SHA-256: 517dcb25e844aae80580b8137ae04c965e2e6867a660feafcce7a123672155c7
font_02_sfnt_off00012051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12051 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_03_sfnt_off0001372a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1372A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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