Malicious PDF — malware analysis report

Static analysis result for SHA-256 225429d12a9eafd5…

MALICIOUS

PDF

150.6 KB Created: 2021-07-04 07:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d1281a80958d0486e039fc9cd0bc237 SHA-1: 5c392ebfd7070d010bb0052e98cb142b9c03d84e SHA-256: 225429d12a9eafd565f9d4a0f7fdfcae97dbc7e47b44c961f2cb4b9f1d49dd0d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the 'link farm' heuristics indicate a strong likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9838

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://krisoc.ru/uplcv?utm_term=the+art+of+the+last+of+us+part+2+pdf+free+download
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f42110c619---fukadetimawaregazole.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/l5tfa825ds57unt7aduu7kgq14/59258090872.pdf
    • https://angkoronetour.com/userfiles/file/xusonigamofinifebudol.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/85447108c83f5a939ab04cf72cc39742/fepizogimotujejasawexu.pdf
    • https://tedvandergulik.nl/userimages/file/83998074040.pdf
    • http://burchiellati.com/file_fck/file/nesalufotur.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ugufktapfopvo2lsqa1duq3ai4/xunik.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b5deb1e2e---nosojizev.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3c48843f1---14296729217.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/2762bbd091932dc48a39272e69c3b210/48863784228.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160829824ec8e9---zubizumuzozuzuguxonuweza.pdf
    • https://rimsball.com/ckfinder/userfiles/files/xokukedowogifo.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b404950a532---80817296164.pdf
    • http://martonaroniskola.net/userfiles/file/tomajiwivo.pdf
    • http://meble-tk.pl/userfiles/file/widirevupolemo.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25b84b52b8---3001092727.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d876edcbdac---67614563194.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/a86n6mnb8kvkefstob6psbm5n9/97584396637.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/f3d9ebf1664d97b1d460371683069636/60544381065.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b64a1a2749---xawadopovexeko.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/g37tuokvm43l1qjj8f6bsjiosr/64841626583.pdf
    • http://zhuoer.ltd/userfiles/file/betuzilatikofirupe.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d2fb.bin
e028ee16cdd367f7a0ebcaa10f2be21caabaed44d2d2826e4e22246947b89e74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D2FB 18136 bytes
font_01_sfnt_off000201f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x201F1 16792 bytes
font_02_sfnt_off000219fe.bin
a56d5ad313c8fec4301ecbf818ec01d859bda03e0e43d153920b2b900f9a533f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x219FE 7132 bytes
font_03_sfnt_off0002333f.bin
49aabaa837b4ec307447dc6c2a2309a4b1f3772010ad6e45513ff97873a36fc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2333F 10772 bytes

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