Malicious PDF — malware analysis report

Static analysis result for SHA-256 93be30dbca31881c…

MALICIOUS

PDF

71.8 KB Created: 2021-09-18 18:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75000eda5e465d0be425f8d8b108f606 SHA-1: 9281b68abd66ae5af15d38540bb0b8649b02cbf1 SHA-256: 93be30dbca31881caf6dc7d473d8010fc00b38e0ad1428b277538ff6e714c1f3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crewmak.ru/uplcv?utm_term=gloud+game+apk+unlimited+time
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/87646770747.pdf
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/16425538661.pdf
    • http://climacom.eu/userfiles/files/86781816579.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/46b6e9149c0b0a41876ac1e24d2682e3/parodezuvorexezidani.pdf
    • http://asfalon.com/__files/file/57625024659.pdf
    • http://targhevaticane.it/userfiles/files/xasaxonigojojuzagejud.pdf
    • http://kunbot.com/upload/files/wimikidubalomoxez.pdf
    • http://guanzhuli.com/userfiles/file/fugudibejajalejuvalejoto.pdf
    • https://rubfila.in/files/file/77297745951.pdf
    • http://shopphutungmayphat.com/upload/img/files/65991979583.pdf
    • https://ovistar-dz.com/ckfinder/userfiles/files/60556636673.pdf
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/kafexovesife.pdf
    • http://pensjonatagat.pl/userfiles/file/99666340340.pdf
    • https://handinhand-daycare.com/ckfinder/userfiles/files/weranerux.pdf
    • https://pima-alarms.eu/slicice/file/lolupewafexas.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161404ad609c95---14919949913.pdf
    • https://pensionradvanice.cz/res/file/vudida.pdf
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/naxemujumawitelawumowiw.pdf
    • http://sjzhtchem.com/upload/files/sejigowamefofivow.pdf
    • http://www.farmaciabergua.com/userfiles/files/kajokitixigos.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4dbd97027---malitifom.pdf
    • http://wumag.pl/userfiles/file/44864251690.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/9b92be9aa5845d15de2b8f40d4aca89e/72990745104.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145bb8070b7a---47869926035.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/j7tnbg1ku43q8u5bcjt5dgjtlc/xovovujat.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_off0000b87c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB87C 16792 bytes
font_01_sfnt_off0000d093.bin
ace6efd12307a407cd7019a3687040741fbad1a37e2141ed3d6afffcca687cdd
pdf-font-stream PDF embedded font (sfnt) at offset 0xD093 10700 bytes
font_02_sfnt_off0000e8e0.bin
32ad6be942d207051d7a12321ea645e8d90c8e3afebca14333017eeea5b1ff0b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E0 16076 bytes