Malicious PDF — malware analysis report

Static analysis result for SHA-256 336b1c0ec50f1c46…

MALICIOUS

PDF

69.7 KB Created: 2021-09-27 08:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3583f6d0e378968db24dbd4c47a875d SHA-1: 3e05e4efc4edac5b06efc38db6ce7cc26fd22b77 SHA-256: 336b1c0ec50f1c46d67c8687be468edfeb958a870df4463a84627e87458f3586
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely responsible for initiating the download or redirection to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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://kingdomofgodmn.org/userfiles/files/62815528292.pdf
    • http://holzbau-napetschnig.at/25274737208.pdf
    • http://sanarina.de/ckfinder/userfiles/files/16549812709.pdf
    • http://blow-w124.com/js/upload/files/13323598723.pdf
    • http://yensaophanrang.net/userfiles/file/94464292490.pdf
    • http://americandeliorder.com/uploads/files/72879609895.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614af8a9411a5---73159631291.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/77ab372f6408b91959d3ce8139347251/tibutepopevowegupujob.pdf
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/86068203948.pdf
    • https://llibreriaha.com/img/events/file/72484670450.pdf
    • http://metapolar.hu/tmp/biwexejufow.pdf
    • http://keemunblacktea.cn/uploads/file/050929168123.pdf
    • https://benmoonpharma.com/userfiles/file/8116363210.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb859346d6---90411295785.pdf
    • http://otohondamientay.com/upload/files/98960073607.pdf
    • http://jedwines.com/cmsCart/upload/file/86424971848.pdf
    • http://beming.com/ressource/site-image/files/jiludamunazesid.pdf
    • http://elard-group.com/ckfinder/userfiles/files/vitolexagivezovunogo.pdf
    • http://desushibar.com/userfiles/file/jodakubaga.pdf
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/vurifoxazowoleganisizez.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351cb20233c---pakuvoburiwo.pdf
    • https://rsebolivia.org/userfiles/file/59474544327.pdf
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/61978735879.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cb5ad0040---66858266527.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=download+pokemon+fire+red+latest+version
    • 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_off0000b090.bin
214cb3b5a6512c3b5d8f898b8518410f08e88bcb1eb4ae95d2049ead31e58e5d
pdf-font-stream PDF embedded font (sfnt) at offset 0xB090 10904 bytes
font_01_sfnt_off0000c9cd.bin
dc1606a8e6a16ae58912a48c66e2ca9bfc7c5082fa36375b005c8c30277c7b7e
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CD 15576 bytes
font_02_sfnt_off0000f12b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF12B 16792 bytes