Malicious PDF — malware analysis report

Static analysis result for SHA-256 2df22b5c95c90c1b…

MALICIOUS

PDF

69.9 KB Created: 2021-09-19 00:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 378662577ec515a8ecfe2d4848f79e79 SHA-1: fb91ae4fbbc517d23c053d026dd136797a33efd6 SHA-256: 2df22b5c95c90c1b5af0feb84455c5b79687d832800a0ce62cba31b2164dffcb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The presence of an embedded JavaScript stream suggests that the PDF may attempt to execute malicious code or redirect the user to a malicious site upon opening.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://autobedrijvenindex.nl/images/uploads/fozet.pdf In PDF document text
    • https://rlmahtani.com/userfiles/files/sofipuzozosapeb.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/dumoxepisirifevemu.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/67618346646.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/53120448793.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/kubukoj.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109181600346216.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/6031711fcd1f4cf5ff7c75f8a970630c/xetokufaragevifome.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/jumuwowaz.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/21403463202.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/2uqli76mhk44m3iitedts9fr34/kazaxonowugumuku.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/4301863775.pdfIn PDF document text
    • http://dentherapia.hu/files/file/23707866127.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141786136ba6---zugogekob.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/poxikewuwusogiwuni.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/95634676348.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/zamumenubaji.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143af51ddd80---damonidenesil.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/tugexogatevujizuv.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/72143699169.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391bfb2b8fe---jajomitofigugebitojezoz.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465b7fe71ac---jotubexozemofomanin.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/93185568211.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+transfer+all+data+from+old+android+to+new+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB405 14708 bytes
SHA-256: 102ffa875e273d6be56faa98e44ef1d3a2256d674f9013bf9d706c9407b58a09
font_01_sfnt_off0000d917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD917 10592 bytes
SHA-256: ecab0033c3ae533e9200d121f47b27d1a3b17db728f5bdf1df914ae42974a1ff
font_02_sfnt_off0000f144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF144 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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