Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc01c32da66922f6…

MALICIOUS

PDF

118.1 KB Created: 2021-07-31 06:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 56f71ab315f3b7a8031f4b57fc4a86c8 SHA-1: f34a7b8e48fbc09ea5100c662c34935f598efc08 SHA-256: dc01c32da66922f61da965c9f6948da8ae9bd48768345316a96a5dcc6ffdea26
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. This suggests the document is designed to lure users to external sites, likely for phishing or to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://pistant.ru/uplcv?utm_term=how+to+make+a+superflat+world+in+minecraft+xbox+one+2020 PDF link annotation
    • http://zoldjogsi.hu/uploads/files/zixeraxerunu.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b519c584a7---57415949397.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608511f703390---9560492060.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/a0e2433da7237ff3fce819f1c5668ddc/gotivaloruvorukifez.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c320803f45---fafolikobebiguvelazodavax.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/guxuzadiwozokefaj.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/diwiverawojine.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/sigefavor.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d958aeaa135---melekisodupu.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0cca7d5f1---19882328247.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/sekatefefunibikujas.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bipaxevufogiwadogusinum.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/wazixapifi.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4765adf31a---27702788492.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/15f2cacf9b5c9c414adf56738c1cc459/luwogusavimefubix.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/14692525955.pdfIn PDF document text
    • http://imaginove.eu/data/Files/litixozajulimamufav.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd207f758ff---zadasa.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099960f76016---kozepodemozawu.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608dffb190644---kobamozojizewobemonilulex.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86490ec237---22806867919.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/77392227743.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/16180960583.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/8954t6a8vf2bsh4g80t1hlbu1m/63786395725.pdfIn PDF document text
    • 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_off00016550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16550 11536 bytes
SHA-256: 2449f782332a5cdb104bfb55fa1cd8c113ece1183cd77d346dbe15fead164241
font_01_sfnt_off00018078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18078 18488 bytes
SHA-256: 0c7b05277634b7e8b3fadccb86d700635f5644f7ed8e9c766a2ab038966ec53a
font_02_sfnt_off0001b123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B123 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1