Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee5b6e84c3997695…

MALICIOUS

PDF

83.6 KB Created: 2021-09-17 17:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 381f2a24db96f628278e904f7ed8f793 SHA-1: 6c9800d8e13ff9430e38889ac04b751cb65b4044 SHA-256: ee5b6e84c399769503ab9bbfe7e2c0b0a85a9b50d7d414474c8782a73308e478
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised WordPress sites. The presence of these links suggests an attempt to redirect users to phishing pages or download further malicious content. No scripts were extracted, but the overall structure and URL distribution are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=assassin%27s+creed+for+android+offline
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc45122e7f---kuban.pdf
    • http://obkladacstvikolar.com/content/70003822703.pdf
    • https://jungleflightchiangmai.com/Uploads/files/84530360264.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/46547491774808d0e534b4acab94a3aa/tisekenafowukunela.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/573d685f1fdf4d6222b2b92e845ecac4/xorumonaduwojosovup.pdf
    • https://alrukn.co/userfiles/files/88258525441.pdf
    • https://bbu.vn/Images_upload/files/20838490134.pdf
    • http://www.iciparis.ru/ckfinder/userfiles/files/91644750748.pdf
    • http://avandcie-automation.com/ckfinder/userfiles/files/duvexinoz.pdf
    • http://21cedu.com/pds/userfiles/files/vakefebakevebovo.pdf
    • http://thechitay.com/uploads/userfiles/file/13484352330.pdf
    • http://fapannimario.it/userfiles/files/47379311952.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/0nk7a3n8udpbk7624mhjvnqpb5/34689790129.pdf
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/58835987075.pdf
    • http://broadgatecapital.com/userfiles/file/2120513214.pdf
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/40455291151.pdf
    • https://delcinfo.ru/img/files/files/55498955577.pdf
    • http://wagnerpc.com/userfiles/files/97117871952.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161376f6d193a4---siraxudorelodef.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/396528620d3ce0ae609383356dc6dcc6/75973548349.pdf
    • http://chickenwild.com/upload/contents/images/images/20890443954.pdf
    • http://softtox.pl/new/userfiles/file/84120781795.pdf
    • http://jyjwqj.com/uploadfile/file///2021090413212781.pdf
    • http://esistore.com/userfiles/file/gofojavuwugulo.pdf
    • http://royalgroup.at/tmp/86697223485.pdf
    • 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_off0000e167.bin
462da578ce35f807fd1274d09692598edeca9c3b82a4af61a17dbf3a101a1733
pdf-font-stream PDF embedded font (sfnt) at offset 0xE167 10384 bytes
font_01_sfnt_off0000f902.bin
9a3a833afc53908584e805f2bdbe8a484ca066b5320ffb9d79ac0d06245287e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF902 18372 bytes
font_02_sfnt_off0001282e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1282E 16792 bytes