Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5fe5289200d6ea0…

MALICIOUS

PDF

81.6 KB Created: 2021-09-21 10:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 942a9795868baa648b5041b91c0908e8 SHA-1: 9b4d777c67c1f1e69979108cf6cc929c17aeee3b SHA-256: e5fe5289200d6ea08e99da181f0db5c3ccc91c646be345c85f212559b6ca4021
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains associated with link farms and potentially compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external links suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=stick+war+legacy+mod+unlimited+money PDF link annotation
    • http://gamecoast.by/uploads/files/37138976288.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/wovedawamadafenemobusul.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/65656659417.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133590e8b214---2155758694.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/3362710651.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/nudojifesesevopadolile.pdfIn PDF document text
    • https://izometal.net/mm/file/44750637394.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/22572400981.pdfIn PDF document text
    • http://kelsenator.com/userimages/81553046863.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1e8589ee0---95102485737.pdfIn PDF document text
    • http://195exim.com/datas/files/36575463474.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/7ae6gpln3hq6iljdjivsnagvj7/juzosoxijagajipe.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/32074359755.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/11681190924.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/fusikemalaxeraguwin.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/89477732324.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/gudefasip.pdfIn PDF document text
    • https://baptistfriends.org/media/rowodik.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/makib.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-01-20-36-19-81.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/vowogafufum.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/49056275509.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/3117353015.pdfIn PDF document text
    • http://citra.cl/userfiles/file/97056516544.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/xipuxerexoxunefelubexu.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/46519917414.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_off0000d9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D3 17480 bytes
SHA-256: 0747268c7b3af1bd826f9662616eeb10a97a6f2667899bd0f6aad2171defbf87
font_01_sfnt_off000106c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C8 11012 bytes
SHA-256: 92d0cb086efdb34af2a8edc5cad98f6f441ac801fe69516c1ead07439ad61f6c
font_02_sfnt_off00012040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1