Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2b15474c03443b…

MALICIOUS

PDF

86.9 KB Created: 2021-06-25 14:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a536b496b2216b1890efeed198f70be9 SHA-1: 269cd177a98ac6da3ec16010bb867fff43df620e SHA-256: 4a2b15474c03443bc91baa9c01ace1fab02922b18092ec81d43f0c786be9499b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect the user to malicious content, likely leveraging a vulnerability or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d08e0196c10d49c7801d89c747353518/45973287211.pdf
    • http://adance0112.com/upfile/editor/file/24092637959.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9fe2f045a---68876832734.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3db00432ef---61459770516.pdf
    • http://chikatere.com/Upload/files/47234230327.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609102dae9cc7---26232871937.pdf
    • https://psfund.org/public/uploads/files/cms_files/rideguwapexo.pdf
    • http://magooferta.pl/uploads/fck/file/vegatirovufidal.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884e7a16bdf---95423773550.pdf
    • https://unitjaya.com/contents//files/30413948306.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c398870e72e---20635490317.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/b26c1d8de9a12250b5dedaa92e39b0f2/sefobusulimileni.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/f0b8f3e534f1ddb0bdc8451a5a116a97/21616395422.pdf
    • http://aire-limpio.com/img/editor/file/pifawaxizeremifonufet.pdf
    • https://ocw.tw/uploads/files/xuzejuzitixilufazakat.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fe114de07---rixedadasikivatosoriw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=brown+and+white+beagle
    • 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_off0000ec74.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC74 16792 bytes
font_01_sfnt_off00010486.bin
a0d38e0e6cef735f70bef2289a8d6b94a0e9307c1ed98e3c1cc7c06ce3bd0256		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10486 19292 bytes
font_02_sfnt_off000136ba.bin
ee5b1fe8bdc0a59da71add3fb24176bb0d5fcf83e0181f03b7e19cd2b1cf9e31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136BA 10640 bytes

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