Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a0c9699ae8ceaa…

MALICIOUS

PDF

71.7 KB Created: 2021-05-21 00:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80a392cb3677c1f3dc3505265089855f SHA-1: 22a1fe73026fef9f36c1585f6023c87287f97748 SHA-256: 37a0c9699ae8ceaa059ea363a469897d30f63cf1f333ef92012155e59264e64c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with multiple URLs pointing to various domains, some of which are associated with compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted from this sample, but the presence of numerous external links suggests a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://powermailer.in/userfiles/file/viminixi.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608372105ad1c---sutuza.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d3bd4b941---23685020084.pdf
    • http://ciaooo.ru/uploades/userfiles/file/65845504575.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/ss2jvjlkg6hvhnbduv8gibd899/93550377840.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/v9ljvdqj2frlt9ee5hp5o6bpro/12043253476.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/jg4aaap49i8cvbfds4hh5sugek/tilikesok.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/u0o9bt13tom4dqpdrei846c8j5/xedigazoni.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/284fe9fcf43b8ef39eb5d672810cf4d2/walilolededikurazavoroxid.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/d14eb939afca05fe6a79aeb0127c7af9/dubijerupelewabamedudabup.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608e76401d8b8---23145400399.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/cd0fb1789dff63b92464ad819571c198/rekufotij.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/9a587f9fd6fa4bb49e7e33024f925c66/jovinidibo.pdf
    • http://agendatourvietnam.com/hinhanh/file/pibegamuvosajikifuwoxuwut.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16081b103bd402---85709485711.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=toxicwap.com+series+2021+download+free
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9b3.bin
38dd33db0c4b8c73616d61dbd4496f9e9d5f6c786ac9994f7a7f840b4c3ecabb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B3 5768 bytes
font_01_sfnt_off0000ed67.bin
544abd72d6dcde7e7418a7f0142b2c9b3ace595d047b8864485f4a593c178e6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED67 10756 bytes

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