Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b5814133e9a436…

MALICIOUS

PDF

88.0 KB Created: 2021-09-09 13:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: db93886983f8275b3bf384342d8a9801 SHA-1: 8ea1f9e2e8fb18070a5156976a61ff3796a70d09 SHA-256: a7b5814133e9a436f197e6f7a3b87fa3b5b861ceccbaa767abebbe55c0583e1a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF containing JavaScript, which is a common technique for executing malicious code or redirecting users. The PDF also features a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites, suggesting an attempt to distribute malware or conduct phishing. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/161371e0abc868---guzak.pdf In PDF document text
    • https://rowsontw.com/shopadmin/upload/files/33931304422.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/76097701112.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342c9d51503---55119479427.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/buritupubu.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/12582547211.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/56339278878.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161338acc32603---xutasuwa.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/nuvaloposuro.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/14303358564.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/8202915664.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/bujizu.pdfIn PDF document text
    • http://stonebreaker.at/20826279380.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/53237031510.pdfIn PDF document text
    • http://hainfelderteich.at/reguxate.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/9a8b0b6f3935c2b7b0da31f2b7079416/71584764672.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/nipiporazo.pdfIn PDF document text
    • http://donghotam.com/luutru/files/54319855237.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/dukanamuvisirade.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/gifutet.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///jewevuwuborabibamaxu.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/lezefuzizubavulevepigi.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/39343293864.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/7n6itg3idqavhn0duc2quh4f44/pewimuf.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/48214161565.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/nonivofejetadevevifiseg.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/a832306086cff9490285905a3d6e93e1/rokerigobagenikoxawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=free+live+football+apps+for+androidPDF 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_off0000f4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDA 17620 bytes
SHA-256: 6b1fa5709d9b1136a2afa95867ec63924852c8d0f57f1734986bd656df4abfb3
font_02_sfnt_off00013a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A08 10672 bytes
SHA-256: a381f9642f2c18a811bd75a63a85e621cd276866efd2485d6237dc89903f62d4

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