Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cc236553bef1617…

MALICIOUS

PDF

64.8 KB Created: 2021-06-20 00:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4931c2e88c1e74370ede0f199b838084 SHA-1: 72af62e44b0d6c9f20dbd07925f7554045fa65ae SHA-256: 3cc236553bef161739f7b83328f80de0c20ed27245368e36df5512390cddfd0d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host and distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

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 http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16099a6d048d77---15510626057.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f8ef59d1894a7d043568aa257c0bd837/tutezitufepuxubefobe.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/a743eidaq33r13mvbcffosvls3/vivagi.pdf
    • http://huile-de-nigelle.info/userfiles/file/wubabugilolavujufi.pdf
    • http://fabtur.ru/upload/files/wepukitimunanuzazadexon.pdf
    • http://saydersan.com/firma/files/zosedinefawope.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/802b57a94073f6566c513f29b5fe6624/fedosagoxufavumigexep.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/80de0e2160a0ecb785afa25ec32491c1/siradaru.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/19068767785.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6dijef148vctt6rjn2rapq6plm/maridav.pdf
    • http://www.urbanwaterways.info/files/9994308782.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/qc2t3752n1l08eo84nngf53484/nafamesosimasagigo.pdf
    • https://sjalikave.hu/pictures/file/89492891681.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/4fa8059e6780345afa4e146a6c341562/sanuz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=two+heroes+watch+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_off0000bfce.bin
9acd1a77945fa8a44f8544875d285d6cdc9f384494d7fe248d55ad3e55e8c7e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCE 4976 bytes
font_01_sfnt_off0000d0c6.bin
ee9e74c68aa86d8ef2690e8cef69a3630c4a7e4dde6194a36c88360fe055982f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C6 11148 bytes

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