Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac0e59de18c4546b…

MALICIOUS

PDF

80.8 KB Created: 2021-06-28 13:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3754a3f9d8403a2da1b7ac165e32d6cd SHA-1: 85a0d7274ff01f1d0fa4473ad0825a429f6f82c3 SHA-256: ac0e59de18c4546b2aecbf5c6c8d107e85922482fa5a40ca4a1aa6e4a476745e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload sites and disposable hosting domains. The embedded URLs suggest an attempt to lure victims to phishing or malware distribution sites, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/lmgph35qboip2qqa2di0cmsm8o/detawajapugireragi.pdf
    • http://physiotherapy-warwickshire.com/user_file/file/64148725298.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/850a61a781a3dce0f11510f62bf0d441/musib.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607450444ea15---rorifubavogid.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/98in5fu0ub0ak7k6qf0k216m1l/xabisiwelozimesabiliwu.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/c9ec7afaf2da8c8ca4120f56134336ab/gewafufib.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a6a3775bd---46182914130.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/a9m38f2jt5q3iaucik3tdbreee/nalubafob.pdf
    • http://huile-de-nigelle.info/userfiles/file/bilanaliva.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607741b35c17b---14777965116.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/mjhj63h3pqh9d5m0h16fn2iqrh/26520074974.pdf
    • http://jkmdc.com/aversystem.com/userfiles/file/vekaxuladuj.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/48f4314362f0eeb4fbfa44abdd47a783/donusap.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d9722c21b---35258402065.pdf
    • http://zae.me/datafiles/file/45257607054.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/74269260971.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16077ddff2f781---bosopexala.pdf
    • https://dalyanestate.com/userfiles/file/98454675400.pdf
    • http://isystemlab.com/admin/ckfinder/userfiles/files/24145627070.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083218ba24a8---93703117197.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/ks0ne8i60frcfk75afum9udbub/fapuduvumaxagafilor.pdf
    • http://nonstopsushi.com/uploads/files/jizux.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16086f6f8d4457---80510436404.pdf
    • http://sportgalaktik.sk/userfiles/file/tiwopawaj.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c40054072f---55622044204.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=nations+burger+near+me
    • 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_off0000d61e.bin
f69b63f45eb95c9de2ef0fe7649b9e54cefa27ba712ef41dce1742714c3e485d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD61E 17488 bytes
font_01_sfnt_off00010430.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10430 16792 bytes
font_02_sfnt_off00011c47.bin
6173ce1709031e1e79c55cafbb8f647b7e5ab65ea1720fd996b970b48322bc90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C47 10620 bytes

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