Malicious PDF — malware analysis report

Static analysis result for SHA-256 88577dec34edf4e1…

MALICIOUS

PDF

74.8 KB Created: 2021-09-30 20:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 248225ebe4d99b4f5de2175dc40c130a SHA-1: 36447c68e978e776455cf6805afdfc3a780098cb SHA-256: 88577dec34edf4e1d444250906e0c95f5ad481bc441eaf962f7da1e41a36c3f7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=autocad+2021+tutorial+for+beginners+pdf PDF link annotation
    • https://badanie-wody.pl/galeria/file/95223194105.pdfIn PDF document text
    • http://tfforming.ru/d/files/nubujulupobiwobado.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16143c6a3a6de2---noderikavapagim.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/fosoloromamonufadodopaz.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/83890139302.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/39017687298.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/17361147319.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/gagejakukonisiguwa.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/27220071060.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/fezabivumutewusojoz.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161491e2e105b8---bijebizisokomibejos.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/53622565970.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/fcc4d76edfc065faf0346e5016f515d6/mavixunivutewobawefisab.pdfIn PDF document text
    • http://dalaichau.com/files/93085342735.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/zekimadewagovekamitewup.pdfIn PDF document text
    • https://dcimx.com/files/7995924735.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/2795248314.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/60217939307.pdfIn PDF document text
    • http://appextskihjthj.handylover.com/upload/files/54701611545.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/laputodadidozuse.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/18546584618.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/28983785498.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/jerejuratofa.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/gipasowakabusatiwow.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_off0000bb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1D 11312 bytes
SHA-256: ba12f6f50ba0866c2ae193e74372e18f1b883305fbf09a40f5991f5a6d789cc8
font_01_sfnt_off0000d57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57A 18460 bytes
SHA-256: 5fd79d8832f445f9498afbea6b2529c47ce7bfbe16b563caac01b3c34713e9e1
font_02_sfnt_off00010543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1