Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b629d20af5509e…

MALICIOUS

PDF

89.5 KB Created: 2021-10-05 17:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9fb8638729ce136de4a04de459b4ba35 SHA-1: 1fe5749f8b413d73c4d5ca744baf90f7f3311db9 SHA-256: a9b629d20af5509e77ffb2506f2337113bbc2ac046468c40c50c738d1576cda7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or link-farming scheme. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to redirect the user to malicious sites.

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.
  • 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://musiclivemarsala.com/userfiles/files/44816869226.pdf In PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/59865752530.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/wefizidopavidimekukifidin.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/vexemurotagijagewemutela.pdfIn PDF document text
    • http://splogservice.ru/content/files/xasuturi.pdfIn PDF document text
    • http://wecareprogram.org/images/file/tigumumalanaw.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3d9b0b0a2---reponipeninogadanijowij.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/gogifenamo.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/46399187061.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe959e5ee6---36528441655.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///7965614799.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/daxalisogemimab.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/mupawelebarovifonu.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/xokugiladipudoteza.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/jefukopi.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/36945160279.pdfIn PDF document text
    • http://hbtsap.com/Upfiles/news/file///81689508383.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/93222585804.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/m05f7icl382vshtio1sahj29t0/23602949860.pdfIn PDF document text
    • http://meskerjager.nl/media/files/1816694677.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/xilaginiravip.pdfIn PDF document text
    • https://autoskola-scp.com/files/60888974896.pdfIn PDF document text
    • http://huntland.hu/upload/file/guporepobavefuzonatejevim.pdfIn PDF document text
    • https://flomogroup.com/upload/files/tamozixefipodure.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/4c1afb935b2948d6493016874a5077ab/5718421447.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/80657293313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=steroids+for+females+to+gain+musclePDF 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_off0000f45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45D 10996 bytes
SHA-256: 108d18eabec945f4b38abf50ee35b61b4430a4c0d58b62151e5ba56694b6e692
font_01_sfnt_off00010daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BC 19596 bytes
SHA-256: 36d5c4a3a190248a4017b17acf8dfa941135a5812a4e36367d829ae799e23773

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