Malicious PDF — malware analysis report

Static analysis result for SHA-256 45dd45fa6fa47f10…

MALICIOUS

PDF

106.1 KB Created: 2021-08-16 22:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 99edb1dbf5e98d3ed40a39066bc6eaa6 SHA-1: 00d5bbae24e046973a4d67aec92b243c8a3bc0f7 SHA-256: 45dd45fa6fa47f1081a5ec8491d4dd49e8e0856ee0f05b48daa01a761aad3f6e
164 Risk Score

Malware Insights

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

The file was identified as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, designed to lure users into clicking and potentially downloading further payloads or being directed to phishing sites. The presence of a 'download button' heuristic further supports this lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607be59be81d6---34669984269.pdf In PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bc450ca75---sovoduvumexivavesag.pdfIn PDF document text
    • http://tourgrodno.by/images/content/file/dejokakedujatuvaxiruvufo.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/naxume.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5e9941180---96722338446.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/afufqufr5c2iq1gfocd7epl6c8/98596362207.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac3728b042---lufabaxo.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/98011975012.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/59876171108.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/raribivegexawilopa.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/zonikowumisexeni.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/98dd796a0ac6d4eae375dcb14b9a1813/guvubanutujona.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/c9dd4e3272fb5da4ad7bfefbede71771/situxozuletepedeb.pdfIn PDF document text
    • https://ivanamihic.com//files/86485425353.pdfIn PDF document text
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/danetovofavewatukuv.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/il4ka6f4h847mjtp87d57gmlsf/vosilomilozowetamazolufab.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac8d27908c---50805787781.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/33009583947.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/forazamakakusetonaf.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/xusal.pdfIn PDF document text
    • http://1982thsreunion.com/clients/a/a8/a85c6617a93da1462bf6c3e7dda9c043/File/93222517137.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/10923221395.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=math+olympiad+problems+and+solutions+4th+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_off000136dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136DD 11264 bytes
SHA-256: 28f9e6a248356ae131f79d4c6aa507f4a3b37cad90c6db44c031b4336b95a42e
font_01_sfnt_off000150b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000168c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168C8 18640 bytes
SHA-256: 2347ce7d615d6aa6b19693955850c8c83be61f19d0acb1098282af000971e6a2

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