Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad36c28f127ba0bd…

MALICIOUS

PDF

86.3 KB Created: 2021-06-27 17:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06119b94a7afaee9cc67dbf5780c9a2f SHA-1: 3bdb178b4c363561afe5b81da4437356651bf359 SHA-256: ad36c28f127ba0bdba503f67621ea5dd432d695c8b872c27b0244fbefc01650b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malware or conduct phishing. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8587e00b08---23752928025.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae643bb0ffb---34782411340.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/74319223230.pdf
    • https://escaletravel.com/userfiles/files/60515411352.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858f260417c---dedofagi.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bba6563e6b---lidowomisizalotuno.pdf
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/ligufim.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/f55a82632751c190169d61c38deaba47/42984314281.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/4ef37e2c388376b573e959e25d8e5245/27852265772.pdf
    • http://aklond.com/UploadFilesfile///2021050211300548.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7884dced1---zuxukesijabuximijubenu.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/0efcc7bfd91a399dbfe8f51ebafa400f/zudelap.pdf
    • http://bclgrouptt.com/userfiles/file/86832653378.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/3bf8265ae42c1fa9db5f3f51fa38879e/24448516176.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085e165f2b8e---diziwigozebib.pdf
    • https://isleo.com/i_photos/file/voduzadejivezux.pdf
    • http://steakclubhn.com/campannas/file/11532724318.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc01eeb25fc---ponujaroseguzexufafe.pdf
    • https://ddshower.com/ckfinder/userfiles/files/bukoxopusavigogu.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3fd7071e4---93736336357.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071da0f9d6f4---mubatibanobupek.pdf
    • http://avs-market.ru/admin/ckfinder/userfiles/files/wewebesala.pdf
    • http://efuegypt.org/userfiles/file/nitagaxanawigojipi.pdf
    • http://cosmic-kino.ru/sadm_files/dodopexefoku.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=aptitude+mcq+with+answers
    • 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_off0000eb4b.bin
21697f65e21e666a6bd4178f4fc311ed423fed9f367fa1d78a2b30e34a130203
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4B 18088 bytes
font_01_sfnt_off00011b2f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2F 16792 bytes
font_02_sfnt_off00013346.bin
dba4d7a565ad581e151c7d2ba898b3cb27ac7d1ef7c95275862aabc20bd025f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x13346 10928 bytes