Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a903acc576435a5…

MALICIOUS

PDF

79.2 KB Created: 2021-10-11 09:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b5bcb0af97771c28d251e4e280ea8d6a SHA-1: 2a1f378475e5a95d11f7d451b33c32237839fae1 SHA-256: 4a903acc576435a52a4351f21e7a85d2705d1466a556ebcb79f1e7db69181ed7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate an attempt to lure users to external sites for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://allytemp.ru/uplcv?utm_term=declaration+of+the+rights+of+the+man+and+of+the+citizen PDF link annotation
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efce8d0681---nixepetozegibigo.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ghsu1htq0efat7frstmdac913q/33656491732.pdfIn PDF document text
    • http://julianina.dk/upload/file/pokekolelunik.pdfIn PDF document text
    • http://akademibt.com/resimler/files/fusolife.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/38627238956.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/kobojuxejemuku.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/mnp56oikcafh3nh13ev8a3cqgr/gizofosadebafitunar.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/3ttin474pcgjrg9frh4cc8d5fi/guledudisejafaposu.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614d11d610ac9---9110569015.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/tupuxowepogolura.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202109file/2021090508531770554.pdfIn PDF document text
    • http://kccmaul.com/files/files/5276365776.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/sotoxijikuxavalumesamexad.pdfIn PDF document text
    • https://renewone.de/files/30726515070.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1615e36b68b633---24400062730.pdfIn PDF document text
    • https://blgjad.com/upload/files/97542072270.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/a88e57fa97d67e946cca5c1f3ff6db32/gazivifatumejazon.pdfIn PDF document text
    • http://lineshare.net/upload/files/20211006005233.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/28594525135.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/befifubeno.pdfIn PDF document text
    • http://sung1.com/upload/files/bosor.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/29093727972.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/77304646650.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/powemurari.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_off0000d071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD071 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE883 17696 bytes
SHA-256: 1d4b298a53b07c9c5dc5d1034dba1646f4f7bda1c1cecda36cc3b0b2e63eca13
font_02_sfnt_off000115f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F1 10984 bytes
SHA-256: 437ef0f7635d5e3232739f033865c9e9af93d05628682ac8eba1e4df686c9fc4

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