Malicious PDF — malware analysis report

Static analysis result for SHA-256 572922e43a992e63…

MALICIOUS

PDF

79.8 KB Created: 2021-09-09 16:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3b765e502a7bb13fa72712a801db86d SHA-1: 2b9d5c445e5a04fca745ea987424de1779687da8 SHA-256: 572922e43a992e63f45b7e91c4d2ef1f1054c706f3ec81575179400e40987c82
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://dreamcatcherltd.com/userfiles/file/rebizukofosafimewo.pdf
    • http://waycreon.net/bhaskar/yii/upload/files/roxorax.pdf
    • https://cargobull.cz/res/file/dupigerupagusemunaramuwo.pdf
    • http://cuacuonanbinh.com/userfiles/file/jatopatixe.pdf
    • https://techinnsrl.com/writable/public/userfiles/file/35151715310.pdf
    • https://itracmediav5.com/ckfinder/userfiles/files/64215115637.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/6b0c9a3d20e6b88d664bc8eca10a3fd0/35524378453.pdf
    • http://fairfresh.net/assets/admin/ckeditorimage/files/27288036390.pdf
    • http://gajagotour.com/UserFiles/file/79386826519.pdf
    • http://aaykpn.com/uploads/editor/files/11075692720.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/24c9313ec8f79dffe773b505b0c0fa7f/tiweponefeku.pdf
    • http://finalstage.biz/js/upload/files/93289856162.pdf
    • https://honghow.com/ckfinder/userfiles/files/78161749773.pdf
    • http://duocmyphamcongty.com/app/webroot/uploads/files/fonaveluzirose.pdf
    • http://sartor.ru/upload/files/wigisivajenajunokubo.pdf
    • http://clinicaveterinariaalbese.eu/userfiles/files/seworakogotavuxivepexoz.pdf
    • http://prvugkh.ru/uploads/files/naxikozelozagop.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383c334d07f---xezudozawosabutunapunolaz.pdf
    • http://easyliveconstruction.com/ci/userfiles/files/51319586451.pdf
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/kapemese.pdf
    • http://syekp.gr/sites/default/files/file/53293061383.pdf
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210905173653.pdf
    • http://wolfpackbasketballacademy.com/content_docs/fopumigotiporuzegedomek.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/45cd3eeafd321ee3d4e5a96898004a49/88874675533.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=among+us+online+free+for+pc
    • 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_off0000d42e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD42E 16792 bytes
font_01_sfnt_off0000ec45.bin
42e7f7c485ba29f52950bfa2a38bbbf703ccaecce4b4df320a1d44936c8b981b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC45 10644 bytes
font_02_sfnt_off000104a1.bin
f9e5bc92fd56b4105b652ccbd2bd7f675ee2d425778ece7d3866e17729d37aa2
pdf-font-stream PDF embedded font (sfnt) at offset 0x104A1 17536 bytes