Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f75974bc505ddc…

MALICIOUS

PDF

80.2 KB Created: 2021-09-02 16:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5873e7a1798f323e9e1414e8160938b0 SHA-1: 4a53b332807fb56375d972f544f05e69f4cc24af SHA-256: 77f75974bc505ddc5090432b548dd631602192f3c218d006b6a1c1088e251b82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://architettoannalisatinelli.it/userfiles/files/xuwasoparo.pdf In PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/lowuxifoxoninezewup.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/43104021499.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/marilazen.pdfIn PDF document text
    • https://adikketiga.com/contents//files/34163459208.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb34f1254---fakore.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/25938725484.pdfIn PDF document text
    • https://12shio3.com/contents/files/gojibunivadenikamuxoxa.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/nudimaxemesupedu.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/maluven.pdfIn PDF document text
    • http://bndweb.nl/upload/files/88528398618.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e3ef8255e---nizexanakelifu.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7550ee98e4---14197162852.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/8927ebf4c6ba3170757d3d89691d2a41/43108558701.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/makujebogefoguti.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/0da47017d9e89062a5219274d84273ad/sevujibok.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102d6d03739a---totiwoke.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/hnbfitmslk2o7jkc2r81b8ea4v/mezoriwijumej.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/zexesafu.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210725_181426.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/6496748349.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/kakabu.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/9a7c7d2f75cb1ab8cdcabbe0b2717ade/35846410731.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/kodotezoragabofivazupu.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/79245343292.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/90730126000.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=recycling+definition+pdfPDF 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_off0000d638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD638 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4A 17356 bytes
SHA-256: 7c722878484f0446e3f52d5bc528b73df161009b1a2dc69a9064b7f4b690ebf8
font_02_sfnt_off00011b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B82 10524 bytes
SHA-256: 1855c89a8c2451448cc9a84c307e11a66fbeb2217e0ced374f5ba1a0f3751985

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