Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f66f762be48368…

MALICIOUS

PDF

80.4 KB Created: 2021-09-15 17:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0b9674ce180c94286ab3079104ea9b57 SHA-1: b5bf4f6601b5eee4ab19955878f2ad27e893ef03 SHA-256: 23f66f762be48368b33f9691ace016812acd72b7bcb555d52519a8c70fedd441
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no explicit script content was provided, the PDF_JS heuristic suggests the potential for embedded JavaScript, which could be used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://catamma.ru/uplcv?utm_term=lanterna+android+apk PDF link annotation
    • https://nbc.com.vn/ckfinder/userfiles/files/xesijezozuvanujaxo.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/sijiduzuduwo.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/13708750239.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/fitovixatebidu.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/jikexas.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210905152233.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/44257816006.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/weluladotoguvugate.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/17701871102.pdfIn PDF document text
    • https://lesura.net/userfiles/file/76844572993.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/makarudimewulax.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/vuwilipunexowogiburineka.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/texuze.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/30026515019.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/relipafebevedikiba.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///1613255044.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/38718242080.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/d6b7eea3ed34be18dfc51bcdb6153ae4/85302474300.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/kupojipunutidelax.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/76741366207.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16137669503f1b---69903784932.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/917a911b144df42a33bcd4480f87acc6/33988649920.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/47820334230.pdfIn PDF document text
    • https://mauspro.net/upload/files/9047733260.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_off0000d193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD193 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AA 10220 bytes
SHA-256: c9959f381b616f09ae3e066a3b86591b1ef88e2e5626b1f78e6d4073f2429520
font_02_sfnt_off000100a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A9 19868 bytes
SHA-256: 777725e40acb616d3f297c7694a654398665e06a298991c6410e5ecda213b986

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