Malicious PDF — malware analysis report

Static analysis result for SHA-256 33bebe73a5721074…

MALICIOUS

PDF

83.5 KB Created: 2021-09-04 03:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 21f90b5bc731be0fc2186816a6fdd3ce SHA-1: 49482d27c63dfcc6f36aff54800c7d105ae578be SHA-256: 33bebe73a5721074578472016a641aa0adbc2c87ef6b959a3d9a8a6cedf1e9a9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to lure users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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 http://cafegreenwichvillage.com/uploads/files/12937053738.pdf In PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/23e02b06a62c5bd2730c51601084c23f/13315869870.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/11d54ba90b1251e8237cf7b61636798d/febenemaxaterujipupoz.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/c14e77cb7978652393f8b867b4d9da79/potux.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/mikawe.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/10503103890.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075104fc4035---zarojadobajogimixoterego.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/ag3re5i7rjnc06lnu3oo6hf5qo/begorasoleporafagase.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/ipdudo0ondh4k1oaknq2bubr26/solexalewuwiwipogavu.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b35f9bc2c---siditewufirotovi.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/nirefotifawojumorebewe.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/5f096f16220709659e310abd81bc503f/87597984894.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/84838860654.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/xulavanupexuv.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/razugosowipovarejoj.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fc344f1d2---kilumulasowozupubuto.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/kekonon.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210610204920_9xyn9j.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/64030726512.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/giriwonikifidipilekukopi.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb4e5a0423---kodofamopolegosaziwar.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/38297864377.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f00f818b6---80475160828.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1608328af675c6---51979468984.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/40049399602.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=convert+pdf+file+in+to+word+formatPDF link annotation
    • 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_off0000e092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE092 18260 bytes
SHA-256: a20521bb9c0f81ec8e9947dee990736254f24236442f3c5e90e7168f44034bf4
font_01_sfnt_off00010f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F89 10672 bytes
SHA-256: d6935ca3bf2445c71c3ecf209215e600a0968a688eadace5ec9ad171a54638f9
font_02_sfnt_off0001280e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1