Malicious PDF — malware analysis report

Static analysis result for SHA-256 f33822ec79530a27…

MALICIOUS

PDF

91.8 KB Created: 2021-09-04 10:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d208557b6a8e22c3d9faafe6357c04bb SHA-1: 4a4c546b023a2c230b6d9e6897de788f918bce27 SHA-256: f33822ec79530a276e3777629e03ae95eb4ed090d82141d5de2520717d77dba9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of a 'download' button lure further supports a phishing or malware distribution scenario. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://medica-brno.com/files/xutemufujat.pdf In PDF document text
    • https://egyiksem.hu/uploads/file/tisevejeruvuwimekagabidu.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/65647571995.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/76911295824.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b2937209641---xurinenode.pdfIn PDF document text
    • https://micsys.in/userfiles/file/zovimagizupeludarekagunu.pdfIn PDF document text
    • https://carlojans.com/cms/file/72062349301.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/dbbde4bdb102fe5046095b719e2e522e/gotatiniwagi.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/6f4c1cf9d2e379785b2bc797598717f5/lamejejesaxakiku.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/jivagobuz.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607394005281a---fadokozokijegemevuwurob.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/galegabineve.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210704_9B10809F9A13F7BE.pdfIn PDF document text
    • http://phs60sand70sdecadesreunion.com/clients/880504/File/64036346241.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/xovix.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/95616238120.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/fa6afcabcba1100f1d7e78670259d9ee/39574528123.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3a70c1307---2152005437.pdfIn PDF document text
    • http://dchs80.com/clients/c/cb/cbc185099defa3274d3d4f74835fd64f/File/53617877908.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/rexemabuvute.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ckt0mll5p87mj36il4pkk7hqjc/rififawitikerazaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=punctuation+and+capitalization+worksheets+for+3rd+gradePDF 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_off0000fd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD79 18548 bytes
SHA-256: f678041a80282f0aa437aeaf2be4f8ba4aee044d7a8feef8ce7ff68149d5fbbd
font_01_sfnt_off00012e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E39 11408 bytes
SHA-256: dd69fcfd087b471667fb6b085c7eb62e496cdc5b590b40c0c9d98ca20929dff9
font_02_sfnt_off0001490e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1490E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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