Malicious PDF — malware analysis report

Static analysis result for SHA-256 a938b378c6083df6…

MALICIOUS

PDF

82.4 KB Created: 2021-09-09 02:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4ece3b3a4bda6d1c866a1591a8f84a21 SHA-1: 911e71248239301f59496dc4b9a10b5f3b045cfe SHA-256: a938b378c6083df6f8934b878f89b81b9be151cf27f8935a3abbc478899ff6f0
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF containing embedded JavaScript, which is often used to initiate malicious actions. Several heuristics indicate the PDF hosts link farms pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute further malicious content. The presence of a 'download button' lure reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/bc49aa10296e7638cfe761a6786c882b/mejejedajinirexekizibo.pdf In PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210909052747_186931248.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/ronukal.pdfIn PDF document text
    • https://fond.ru/userfiles/file/zetoberon.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/48727222324.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/21125247339.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109050104531094.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/8d5061ca3b49b9cd81ff178645795568/sasopasasakifojunigabap.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/nonenemarelazifu.pdfIn PDF document text
    • http://flomojapan.com/upload/files/83685540807.pdfIn PDF document text
    • http://zaiger.ru/img/file/43578330077.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/sopuditari.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/81685778364.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/77436048061.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/nadodelasufujagerusikulex.pdfIn PDF document text
    • http://lj-group.cn/upload/files/nexuram.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/vazesabuganazivinagudanob.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/48000809421.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210908044848.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/6357890935.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/51580292229.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/muboduga.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1612f42bd47593---raroxi.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/remutufo.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161362c893d930---rebamedub.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/zawomopanafubudesemunebed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=outlook+message+format+unicode+to+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_off0000dbed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF404 11180 bytes
SHA-256: 1a2cdaa06ad8935f52401c5e7ae486f35f753ee3fa0b60a081336a65524bc538
font_02_sfnt_off00010df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF9 17420 bytes
SHA-256: f96d9ad3aa8026f7f0d25829dec18bb67e81b968211613e6ed4538aeb730579f

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