Malicious PDF — malware analysis report

Static analysis result for SHA-256 b534c890318fd306…

MALICIOUS

PDF

100.6 KB Created: 2021-09-04 09:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eadb8f007867a5552868354f9dee91b2 SHA-1: d274b874f39c82b3000fcd7224d5b44525ae5379 SHA-256: b534c890318fd306ca0b8613291e662d12a8dcd45aaadfccd8f3d329fb1048a7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://huntic.ru/uplcv?utm_term=tenda+router+ac6+manual PDF link annotation
    • https://parlagame.com/calisma2/files/uploads/sejefakev.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/90792478062.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/qdter6hk4p651ks3m01maj1mjd/lonabijagoxojimo.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/da4f4e6d2c249abb6318f8c625f97bf7/95122450432.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/govozose.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/sj6nde4u5dalb50nf07siph8gs/vujakoritupesafo.pdfIn PDF document text
    • https://ikima.fr/uploads/file/88382237388.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/vobudiz.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/xomemisosapu.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/k4n2o1io6ggtkb90mkaujgb5g2/76298810125.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/30384784520.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/57931897173.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/96524974592.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/fixaduredosijeduram.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/kavosigeweg.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/wuzokazodofaj.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/50802957443.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/c3da572c9cea84d55bf54fc7014c88bf/20541630895.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/libapulekujilizumafitekij.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/20272039437.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97813e7810---50724717393.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607aff1d184fb---60093078096.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_off00011f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8F 10500 bytes
SHA-256: ed5dc740f2f0b351c2d44a1917e759d9a472b8ea234739b8677a14d2a9a47db9
font_01_sfnt_off00013778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13778 20300 bytes
SHA-256: fc972de7247498d2c9aa77fb3707e33dba8e3126ce546e6661509a3467b2f6c5
font_02_sfnt_off00016cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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