Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5a3934e9c8ef72…

MALICIOUS

PDF

86.3 KB Created: 2021-08-02 12:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ae905e0cb57d8a00d13cda8277e3929b SHA-1: dfbe331cca54431bb177da33ffff7919c3856c41 SHA-256: 5f5a3934e9c8ef723b8bdc04eeeff4cf80cf8187ecebf69ecf48f7ae808bb254
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • 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://krisoc.ru/uplcv?utm_term=frozen+1+pelicula+completa+en+espa%C3%B1ol+latino+cinemitas PDF link annotation
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f21719da42---69624339922.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/71e69c5d25f38dff623746a69506e2a0/67013125402.pdfIn PDF document text
    • https://12waktu.com/contents//files/34805077713.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608226cae2e76---76749455428.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/d2aaa1ee7b2809f37717ec6f8d0dfd44/filurusatalexekelaxu.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/30955318461.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/13967174533.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/mevotufeto.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/07/files/210731052948.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd819aebdfa---rogadusotimupefezofup.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df2a4b11231---tatugu.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/12221905545.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa40ca626fe---fupawozakemizekisevedikam.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/51553322329.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb6215f40d---27238254103.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/6ea31e0662542f5e8bcdbf5096b5ed3f/nonuk.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/gasadekojumifagowu.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/gojerilixuxakidudaso.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160793c4f61842---xivojamoza.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/pofaxojimo.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/sasoperanededefa.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/38254925025.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3b7b7565f---sapubakazapunimevufiv.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/55vo8m4u1au4ilebkhdecjnnd7/3976061257.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/69211816802.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/ef6282287805da5d5b2fb00be5752e47/nojakejikuvufuwekudaru.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_off0000e4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A8 10928 bytes
SHA-256: 4d0900de3e6f18192c78220b74d1de4fc4645bd83892a88f24b4c9c1278f1ae8
font_01_sfnt_off0000fdc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D5 19800 bytes
SHA-256: f90b471b42044e01958153f49fea90bf197d738b3ab09369d25969661f61f0f3

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