Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd9939716ce4736…

MALICIOUS

PDF

98.1 KB Created: 2021-09-14 09:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b1e555e15964b9db424940e9277c3f68 SHA-1: 6e028186ef6783adb5f7c81fab11f25d33e6a72c SHA-256: 6cd9939716ce4736b682751ea43a55cb4abd72d7859506871019780a817423c9
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which form a link farm pointing to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of JavaScript suggests an attempt to execute code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 8

  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ketchas.ru/uplcv?utm_term=the+secret+life+of+walter+mitty+full+movie+online+watch+free
    • http://tacchigroup.com/public/thread/risorse/file/mudunibitit.pdf
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/2823615598.pdf
    • http://imaginove.eu/data/Files/93596748460.pdf
    • https://aawyx.com/sites/default/imageuser/file/46877704643.pdf
    • http://kleinschadenexperte.com/userfiles/file/buvuwevelomavaj.pdf
    • https://repare-ton-smartphone.com/userfiles/file/lajatatuwonikifugebekuj.pdf
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/wedibizipan.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613886de4a99f---9784022362.pdf
    • http://metabolitplus.ru/files/file/kokomevedo.pdf
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/91377291671.pdf
    • https://imad0c0.com/js/ckfinder/userfiles/files/5767748425.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1612f365ed9e19---vegene.pdf
    • http://krzysztofmalec.pl/gfx/fck/file/sepitoravonalir.pdf
    • http://nscenter.cn/upload/files/45411044900.pdf
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/taponag.pdf
    • http://candybeauty.vn/upload/files/2608217187.pdf
    • http://studiodugnani.it/userfiles/files/golifapivor.pdf
    • http://cec-intl.ru/app/webroot/files/file/46800914507.pdf
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/bebefikupuv.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/c4b2389e2ef95c0cdd62e00eaa736bb2/getarejobemubovemej.pdf
    • http://murasakijr.com/uploads/files/vavezixixeximamavelipiw.pdf
    • http://meandnetworking.com/ckfinder/userfiles/files/deladenuxaxujibetis.pdf
    • https://bhsbeacon.com/FCKeditor/file/86081816082.pdf
    • http://surmounttravel.com/userfiles/files/fapusarawezoragi.pdf
    • https://cincia.ro/ckfinder/userfiles/files/21296905769.pdf
    • 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_off000114ac.bin
9b54841e30ad3f92fbf94bd1c58e1e8abb3ab164b38b5d2c790501a3f8f4c2ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x114AC 19756 bytes
font_01_sfnt_off00014899.bin
2d5a9337feb3aa89be6ac81a6ca4542d8917435c5fc07100a5a2992823299b39
pdf-font-stream PDF embedded font (sfnt) at offset 0x14899 10932 bytes
font_02_sfnt_off000161dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x161DD 16792 bytes