Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd10fc837cca826a…

MALICIOUS

PDF

87.5 KB Created: 2021-09-04 13:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e6ce5c1436b4a5d9e7ad0f44971854d SHA-1: c4f2fe1ef6af00276b10a677546539c0af621aa8 SHA-256: bd10fc837cca826a32c8915dc64b749f6b2ff890ae09469e1c664e1a5fcf368a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or trojan delivery mechanism. The document functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised WordPress upload directories. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest a potential for further malicious activity or redirection to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://hoangle.vn/uploads/userfiles/file/reravevugufuminik.pdf
    • http://www.bufolari.com/public/immagini/file/32916312279.pdf
    • http://guinyardfamilyreunion.com/clients/62985/File/basanefida.pdf
    • https://menlopark.com/wysiwygfiles/file/tomow.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160894194811cf---6846925517.pdf
    • https://dadrarad.ro/userfiles/file/97561309543.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d51316c06---12551467998.pdf
    • http://andlupa.com/userfiles/file/92807814612.pdf
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/xuzodinegimas.pdf
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/54594051403.pdf
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/majikizev.pdf
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/71931273339.pdf
    • http://billsky.ee/files/file/29216075763.pdf
    • https://airshow-bg.com/file/zezew.pdf
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/42194893378.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7e3b288a6---83184271130.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1611f60ee39282---dibifowesiso.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/a338b921e3a12933f088d7a5c4b954a5/wanisanoriboverafotadet.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/79655b22b592b383c1cc1c82623e3477/26714700589.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16110ed3be8d84---55113828136.pdf
    • http://rydelko.pl/userfiles/file/wazekanalixi.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16113057e22217---86151828051.pdf
    • https://hsse.cl/files/seberidobazopananusewup.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=2014+camaro+ss+manual+review
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f021.bin
ebddbf40e2aab5c852e12442a5aac82faf51c325d5f690a1bbf3588a2c4a2e5a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF021 10820 bytes
font_01_sfnt_off0001093f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1093F 16792 bytes
font_02_sfnt_off00012151.bin
d1977b420fe0e7943523b623f7f54e893e3c187d47497f821c613dff926e83fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x12151 18396 bytes