Malicious PDF — malware analysis report

Static analysis result for SHA-256 a136e066c9a5d67d…

MALICIOUS

PDF

82.3 KB Created: 2021-09-20 15:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 641f430f978b16331567ccc19627aaec SHA-1: b14a3e8d51678f95d90b75306dd966888c9912f0 SHA-256: a136e066c9a5d67dba82b553a32fdced4bcb60383989f04e47f0c0e5e3e2106f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tesikuzotitesuw.pdf In PDF document text
    • https://supermagnum-bg.com/userfiles/file/runenadire.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/vivezugilelasopafaxorep.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/92048051603.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/bimif.pdfIn PDF document text
    • http://dasbluemchen.com/rolatukuwari.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea4e78fa25---bijoni.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390540cba2f---jidomutosemomiranoxuro.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/lapivimepapagavetaga.pdfIn PDF document text
    • http://htwy.com/upload/file/89242400687.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/debajix.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/tefupow.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/wefamabaxexubatuxit.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/gilexabatigora.pdfIn PDF document text
    • https://clubon.top/uploads/files/72507882602.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210913022054802170fi8nfs.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/tegikabalurususuwajimi.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/54401528050.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/refofojebewijiwuf.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/94945229679.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/wigugemobilepemi.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/pokekazizorijuderi.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/ad8e2180b6e0b6c8f7cbec2cb88de059/pitowu.pdfIn PDF document text
    • https://lordoptika.hu/files/files/sufofusirit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=mycard+nfc+cracked+apkPDF 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_off0000e121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE121 10288 bytes
SHA-256: 1b9e9e495004124a2b90e2f94794c5b0955a16036f18fd0062d4cf912a5a70f8
font_01_sfnt_off0000f868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF868 16796 bytes
SHA-256: 1e411079048993f461ca6767bcd3ae44322a0cd6f01a04c98ae8efff5d53ba11
font_02_sfnt_off00012361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12361 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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