Malicious PDF — malware analysis report

Static analysis result for SHA-256 939eb3abafa60fbc…

MALICIOUS

PDF

75.5 KB Created: 2021-09-26 04:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e79dd42f5f647bcfcaf0a876016f9bc4 SHA-1: 24ddd2e12c8572934f018dbd600d9cfa6ac53808 SHA-256: 939eb3abafa60fbcae7d2501fc0ce2eec3d96c1b84bff94484b9603b8dc79f0d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

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://wastran.ru/uplcv?utm_term=motorola+print+screen+android PDF link annotation
    • https://agrocare.ro/ckfinder/userfiles/files/11806251507.pdfIn PDF document text
    • https://j26clean.com/upload/files/80715655319.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/60909853806.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/catnpslqp18b92amfld6tdpjn2/zafetuzagaruseraxaxi.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/2862292108.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/18168133752.pdfIn PDF document text
    • http://iknow.pl/files/file/79045852245.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/97875961023.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/f386989ccb84311947f27e26f72961a9/riram.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161491904539fd---79644105034.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/68712233401.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/33407935265.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/fazupumewurabupetexu.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/76613881410.pdfIn PDF document text
    • http://creationart.hu/files/file/89016348215.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/90018883740.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/gimax.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/tenupatirabinulujifugor.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/80400395ff1b3cfb9b5369884867934a/lajopeguvoninurep.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/66367235510.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/sisef.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/4344768275.pdfIn PDF document text
    • https://protrialse.eu/files/files/nedodi.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_off0000c1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AC 10500 bytes
SHA-256: 1f314d10193cf170cbe2b3a65ddae12f3642a204b2ee502330c076188d92efc1
font_01_sfnt_off0000d9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AB 18084 bytes
SHA-256: a14ec035f315dc3d4482c07fd3bd355e79e106ba3979e3401b8db909e073140b
font_02_sfnt_off000108a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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