Malicious PDF — malware analysis report

Static analysis result for SHA-256 eea1f83eb2acb2d7…

MALICIOUS

PDF

78.6 KB Created: 2021-08-12 03:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee475290d0c59a4b586cb5f07f9ad601 SHA-1: 7de0ee1c8ae8f5b4ecd4bc4e4aaa0b9944fce5e7 SHA-256: eea1f83eb2acb2d7f9027182da709473a56220e28ef5977db2f74e99ee30b951
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/89906849897.pdf
    • https://baobihungphu.com/media/ftp/file/lezaxajokixuxinorodomo.pdf
    • http://thanhlapcongtykiengiang.com/upload/ck/files/migurizapikizabuniz.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14888a5c21---bazuxajuse.pdf
    • https://creativitagh.com/pevron/www/img/file/11580627627.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/14b9sc4da451emr5tmjas7nss2/totixitasaxu.pdf
    • http://zaun-produzent.de/userfiles/file/jawegopexetilox.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/nukudv4t41bcti8qs2kg90acmv/tiliwepolofimiwir.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160781ce11fe7f---rasudupulamiwetunemomo.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/fleclu5fek120e49l2cl2t7a2h/3019853695.pdf
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/44499703903.pdf
    • http://taiwanglassgroup.cn/userfiles/file/39487134682.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/bf39fc5e72dc93fe0633542de554bb50/jigakuwulokarowaredu.pdf
    • https://atraba-holding.com/userfiles/file/fumaxiresij.pdf
    • https://nestsearch.in/admin/uploads/file/69250816111.pdf
    • http://ukonlinedirect.com/userfiles/files/20518059239.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcc8e0e553---pukenexoteli.pdf
    • http://burelomdo.com/ckfinder/userfiles/files/gifopa.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/b95862ce7e495b89738801566d055a80/diripimozenikevexawamof.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/449a3488e4a2aa9369df492f17c09bdd/jogizaxuwaroligodufibig.pdf
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/gevazapub.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=alliteration+worksheet+5th+grade
    • 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_off0000cf75.bin
ca69fabeb28a69a0bd15ef910d3a875f532ea3d222514ce4a45a9d4f093e926a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF75 16808 bytes
font_01_sfnt_off0000fb0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0A 16792 bytes
font_02_sfnt_off00011321.bin
6042910788c2f47792683c1ae74a3af4a9f6750be58da67468cf0ae363e3ecd0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11321 10820 bytes