Malicious PDF — malware analysis report

Static analysis result for SHA-256 92de9c01f40d6f35…

MALICIOUS

PDF

86.2 KB Created: 2021-09-10 17:38:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cbacfd65a6c988a96571154d4e9521a2 SHA-1: a3edd71b7471dbfedf50bd73b4f4f0fef0e1a4d1 SHA-256: 92de9c01f40d6f350e7370757cb70a0017dee10f350a4aee203fdb833e279b84
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 hosted on compromised WordPress sites or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pixomot.ru/uplcv?utm_term=minecraft+survival+city+ideas PDF link annotation
    • http://seghers.kr/data/editor/file/3790339746130d908b5523.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/87247360755.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/59241816798.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/52487991767.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210901220502759452nxork.pdfIn PDF document text
    • http://shriramashramssschool.org/userfiles/file/50741282990.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/gerul.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/7c2266bb5436733cdd059701458ea1f2/31668385649.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135865fe5a44---44946397096.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/58853262157.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/5304198472.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/96613549004.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/3c8ee5ce4f7319c4c3d7626d656ce287/bapibozakajulijakodidifu.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/56238907462.pdfIn PDF document text
    • http://whdhgs.com/uploads/file/202109020434573.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109080701208920.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/gulenefu.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613387bc49cf8---nasidirulutadole.pdfIn PDF document text
    • https://huanghecables.com/d/files/pinikupoz.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/wojisomijurorijo.pdfIn PDF document text
    • https://path.mn/userfiles/files/venibavarapepa.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d259ccfee---28406101434.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109051131546160.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_off0000eded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDED 17400 bytes
SHA-256: 2efe43e7b20698b1c7b909a8a4f7147f49355e14a32540417c71ba3823ca9ebd
font_01_sfnt_off00011a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AE 10620 bytes
SHA-256: 2ac3adc9f89696afe0ff6fe037e3be040521aad1affa585b1bb65b53281e8026

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