Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c36f7eec5e81c2a…

MALICIOUS

PDF

85.3 KB Created: 2021-08-10 04:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 323a48fad5bde2900a73ddb0784f72f3 SHA-1: 244e6220a027c2100368d9b9611f06c5b63d850e SHA-256: 4c36f7eec5e81c2a624ba5428feca2d0f845b7e8c032a916dc757b314363a16e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, suggesting it is part of a phishing or malicious redirection campaign. While no scripts were explicitly extracted, the structure and URL patterns are indicative of malicious intent, likely related to spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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 http://dxczx.com/ckfinder/userfiles/files/20210611_123136.pdf In PDF document text
    • http://abwmechanicsville.com/uploads/files/seseki.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610540551af1b---99117585282.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/62055593359.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081513d26101---kesajevutujebewuladizut.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/71534414812.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/28938684433.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a737e1e133---99974870312.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/virofodijiset.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wusikenav.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfdeb3fceb---kebumibixiga.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/fq1evgabmm6lmkur356cinr64q/vazagulifefezope.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/mowiwafiderepuja.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/12099637129.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/66fupink2llhgqtphns4dgk9a1/9783501626.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/ddba88b45484e579652e757d631e1a91/67375884170.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/povepojexomok.pdfIn PDF document text
    • http://wahibluedevils76.com/clients/5/55/55d7338a7abcce318bc847d7f34994f5/File/14604753120.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/46605638733.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/wewakosivamusex.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/nexojodezejukagazamego.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/52443872427.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/4281208686.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/melalar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+the+crew+xbox+360+freeboot+%D1%87%D0%B5%D1%80%D0%BD%D0%BE%D0%B1%D1%8B%D0%BB%D1%8F+%D0%BD%D0%B0PDF 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_off0000e415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE415 16956 bytes
SHA-256: 16dec853ec650e6aaa80036d23e3d3e998fa137eb46fd1b66f7e8109b97adde2
font_01_sfnt_off00011007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001281e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281E 12232 bytes
SHA-256: 8db1f3c1d6b1dfe7f8fb0433bbf4374e6abd457dd1caf2098737a3e8bf795063

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