Malicious PDF — malware analysis report

Static analysis result for SHA-256 f536f9a4531657e4…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 22:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95ba92d2b122e26e80184e259ecb8572 SHA-1: f685af49db2fab2e852f18d1935293ba81eec7b4 SHA-256: f536f9a4531657e459cc00a60e7fe677ba7c765f7d5add21b457cf0dc9cd5c6f
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The file's structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://philabc.ru/uplcv?utm_term=crazy+stupid+love+movie+download+720p
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613043554178e---zifadikariwakemibiwivut.pdf
    • http://we2meeting.com/ckfinder/userfiles/publics/files/tosimipopudugazobofafux.pdf
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/99917417212.pdf
    • http://miskolciharsona.hu/pictures/file/51291614062.pdf
    • http://stefanourso.com/public/userfiles/file/kekuwajunelojinuvov.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c02f48aa6---futobozufarumufub.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161461987c5878---7425160221.pdf
    • https://markyatirim.com/resimler/files/26039816020.pdf
    • http://bbfederico2.net/userfiles/file/5842413557.pdf
    • https://balbok.net/admin/ckfinder/userfiles/files/fevuwolunukewuveke.pdf
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/dutege.pdf
    • http://tythb.cn/uploadfile/files/34625673784.pdf
    • http://skontrolsengineering.com/file_media/file_image/file/sebeneresafovuxuvigite.pdf
    • http://bitite.lv/media/txt/122/file/kejenatemofafarigu.pdf
    • http://tokyosushilohaus.com/uploads/files/xisemeguvigewuzofawixi.pdf
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/41284293929.pdf
    • http://clainvest.pl/userfiles/file/91567012591.pdf
    • https://advantage.ee/media/contents/file/ginajusiwividupamopogus.pdf
    • http://uitvaartverzorgingsindex.nl/images/uploads/67931172502.pdf
    • http://nakloboucku.cz/uploaded/file/37052342678.pdf
    • http://reversetheclocknow.com/ckfinder/userfiles/files/36892575538.pdf
    • http://kmkonsult.cz/userfiles/file/jamilujapesax.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d756.bin
9966105333bc35e8829a30702d18b9f57ee5c8f062e59a628cd47f0a6d07844e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD756 17380 bytes
font_01_sfnt_off00010496.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10496 16792 bytes
font_02_sfnt_off00011cad.bin
a036fc6dd6644db73be85e83a2b65384a24459c528d0808262c2f46934493a15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAD 11300 bytes

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