Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e5baded63e3c1aa…

MALICIOUS

PDF

79.7 KB Created: 2021-09-17 21:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 08832295f4df5bc9b60c34a47f20c0b4 SHA-1: 657360326081acde6d8cf379178e9b4447df1df2 SHA-256: 2e5baded63e3c1aa370d437811c3d09a2269a4334ac559714fceb15afb380a9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URI and link farm heuristics suggests the document's primary purpose is to redirect users to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=ping+android+phone PDF link annotation
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/60a208ff22e0970559c8558511b955bd/20224764290.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/matoxezesisuvabegarirefij.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/49261742858.pdfIn PDF document text
    • https://iohrp.org/f_files/files/38330009609.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/5b66541b48cf49d3d7006ff36b7b0560/pisoxivow.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/9655955132.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/ruwoguwulabuwuforogof.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/70407334913.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/tibutu.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/mosejowedu.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/fopuze.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/87780828240.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/duzenitetufopudetel.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/36079708312.pdfIn PDF document text
    • http://synfarm.com/upload/files/43295909624.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/rajuzog.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210916105746.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/18615232553.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/kikaz.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/37675648289.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210910070353_c2iy2g.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134162a921c0---26639570800.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/f2a8aa8de6a0d343aedf9dd3df5dfc52/22833590835.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/910b674047a3d5c69087fec02754acb3/gipinezenawekuse.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378228e5be7.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_off0000d7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A9 16484 bytes
SHA-256: 4d32d03060b77815a3a183e554fe0e61c31479ae33a0003ea0b2126be4076c11
font_01_sfnt_off00010294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10294 10360 bytes
SHA-256: 15e0dba773f6c24d31d7a8af7e3410b61098fcf6fe82a3d6347d7732e862fd90
font_02_sfnt_off0001199d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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