Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf6a22967b9f5e54…

MALICIOUS

PDF

78.4 KB Created: 2021-06-25 17:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ffcff463b4af0a96b46225b27daa90f SHA-1: eaaa782915594f443bfd31fed75381e3164ede5d SHA-256: cf6a22967b9f5e54061539fca4dca76b786892e74fc7264c3eef32b1e9d6dfb8
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. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to phishing or malware download pages. The presence of external URIs and link farms suggests an attempt to lure users to external resources, potentially for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2ec72ab23---19920105571.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e6a8b4d82---kexoje.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/1fc7fe624af413d6eea864972e58aaa8/53496053472.pdf
    • http://firmykominkowe.pl/Obrazki/edytor/file/jomanaxenusuxexurisivofi.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e70683e1b---22949226119.pdf
    • https://hometeamcorp.com/images/usr/xovutapewekobatowi.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c42a5f4c1---nobiwukotataluxexire.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d5f980bfb---83134658984.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0315a94c42---wojipewurasukuzi.pdf
    • http://www.heksan.com.pl/file/lomagolitobadatipudu.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/dikotutogeludifis.pdf
    • https://catequesisnavarra.org/guiarte_userfiles/files/5033892047.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/f527gmium7oqtba2dk1pa29iu2/15904590539.pdf
    • http://hutbephottaihaiphong24h.com/upload/files/54198051953.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3067b8b64c---18634603899.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/chit4bekvg69n7ha3c75ps3e9l/depimugasesafavuzigab.pdf
    • https://bancodevida.com/bancodevida/admin/images/image/file/93737263517.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/l5o5kgr19l601ksqh20o2jbv15/52412310559.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16081005ea67dc---42463666574.pdf
    • http://burrburroughsfamily.com/clients/55468/File/kawowilugudo.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b3590682850---tezoxemidoxivapo.pdf
    • https://agermag.ro/mm/file/fitexapolerisiwulalofube.pdf
    • https://campermagazine.tv/public/file/zaxuzake.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/h0j25sr51k5bvcho2l9pi55rrq/temuligadusozavi.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/3da871bcd485c15316515cdb92823661/funurasedozeg.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=pdf+to+word+converter+with+math+equations+online
    • 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_off0000ce4c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4C 16792 bytes
font_01_sfnt_off0000e65e.bin
8e362d0a003d35985a79e7d5343b75d2f7fe391c2a307a90b7fdd9ded2344d06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE65E 16836 bytes
font_02_sfnt_off00011223.bin
9501555ac028244fd173edffff4d05485f0fb7af306b5e936eb27b00e49e9eb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11223 11140 bytes

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