Malicious PDF — malware analysis report

Static analysis result for SHA-256 d63a0afb88a9cdc6…

MALICIOUS

PDF

82.6 KB Created: 2021-06-26 00:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 52d9f7f9488c01edc5f21cdeef95bd9c SHA-1: 33aa848bcca9f262b43bbdb66b01720a6d8f5723 SHA-256: d63a0afb88a9cdc6620a5fdc6b92535c0eb24456e052e7b6d30f8263aaeb0cf2
156 Risk Score

Malware Insights

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

The PDF file contains a link farm that directs users to multiple distinct hosts, many of which are compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs suggest an attempt to lure users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/8ari1v41r1k5pdv7p9jqdr1sn2/xigadu.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa259151d33---zijodinevowajas.pdf
    • http://macabrey-luthier.fr/data/Files/pulubana.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073e257a97c3---guriwedomabolapubudulik.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607e044352b3d---13109473208.pdf
    • http://safeabortionnepal.com/userfiles/file/mutagul.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/k0kehch71ful5egq3ui12kebta/tadubupudig.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/d550a266824efcb2c501ac4403d34051/jonugonifirudatafiwosesev.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fc2b5ed49---lesokebedezaz.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e01bd8cd6---70819439734.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/635d71ea9175dae7d15acb8bf7543a35/97336135599.pdf
    • https://campermagazine.tv/public/file/xotexukugamelen.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/072d070e0537338969de6b1971b96ccf/pujuga.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a837d8c7a3e---46797924481.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844e86c5dd0---fasojedapaxuxetor.pdf
    • http://globalquestconsulting.com/userfiles/files/vagivumonege.pdf
    • http://occahomesearch.com/userfiles/files/gevigorujugaboborodubo.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/a17cd79f070fac82267304d23ce287cc/50147320817.pdf
    • https://alnahamgroup.com/userfiles/file/43929821231.pdf
    • https://mt-creativestudio.com/ckfinder/userfiles/files/27188984057.pdf
    • http://crediramasrl.it/public/file/31838548001.pdf
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/83305550171.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607996c96860d---82239099770.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088779106323---rimejumani.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=roof+slope+types
    • 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_off0000e0d1.bin
7cdbed6993cee05a42e33682842d5d6113c6234f16dde42d76247a3c60647140
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D1 17600 bytes
font_01_sfnt_off00010eb8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB8 16792 bytes
font_02_sfnt_off000126cf.bin
409bf580bfe0860283aa2eec5ca7788c71ba85862b6a1ea4be2f2a5440aac962
pdf-font-stream PDF embedded font (sfnt) at offset 0x126CF 10052 bytes