Malicious PDF — malware analysis report

Static analysis result for SHA-256 378dee12457102e7…

MALICIOUS

PDF

86.9 KB Created: 2021-07-04 05:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32f2804ccbb99afb9d4de6b980e6917a SHA-1: 49243c234de03d80cc49f6fd9035279659047653 SHA-256: 378dee12457102e78932963b26bdf9ac9690ab3294bc8016187f0540296602a1
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cleaner.pl/userfiles/file/39261048927.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a35f315398a---93362280266.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/m1onf4966058n80fghgtrk2tes/gorowotitego.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afb36fe920a---42753371008.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f59e3c80c1---rekiwejidikugonuzexipinu.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a2b3dcb76---78116461733.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/17800755424.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad40835e67---82954361668.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/2d12f31d6829bed77a82e1dc1f6a33c2/timige.pdf
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/9094058507.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b5769cc883e---wudulilomalezinadofosi.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f03b8740d---93636124984.pdf
    • http://architettogherardi.eu/userfiles/files/24571133076.pdf
    • https://ahreco.com/uploads/news_file/91965445530.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a050c1371c0---papusupabobuguwasibanupix.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37e9712785---45805077794.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d77b67e6594---5863348651.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c12fd49528b2a083e199f217728ea584/26021759186.pdf
    • http://ecohouse-lab.com/userfiles/file/49049616191.pdf
    • http://knshzj.com/CKEdit/upload/files/10082877216.pdf
    • http://homespakistan.net/magzine/uploadfiles/file/lowupukoxobexosepo.pdf
    • http://dzwigipoznan.pl/userfiles/file/fumoxumune.pdf
    • http://allg-gyn.ch/userfiles/file/teruvizepimuge.pdf
    • https://condominiobrisasdelnorte.com/userfiles/file/dofuwovol.pdf
    • https://menlopark.com/wysiwygfiles/file/32887697484.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=best+wind+mph+for+kite+flying
    • 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_off0000edae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAE 16792 bytes
font_01_sfnt_off000105c0.bin
d337f72ea287ca040f93709ccc7943d88f226c6345af58f66c9e7a51131a02fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x105C0 17376 bytes
font_02_sfnt_off00013322.bin
39c65555423891b5bdc41adcc44275bb20cf14d522d186a3c88473b0813b325a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13322 11128 bytes