Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c505deb4707888…

MALICIOUS

PDF

88.9 KB Created: 2021-09-04 20:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 74e1e29ebf692d6c4bd551dd6d334456 SHA-1: e0da819d4fbe6b41a03e6b9fb0baeef34099cb97 SHA-256: 09c505deb4707888b37950452780ecc0654fbde0812c4e32138b55d78fdc8bca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV, with the signature 'Pdf.Phishing.Trojan'. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://jtylek.pl/Upload/file/15431730656.pdf In PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7db19e30ed---66189165416.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/7647298645.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/86958709590.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cb8f70807---bulemesuditovejo.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16095c9c941e62---61629086181.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/sujovowokefu.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16118ffe01f787---lawedewaxeripofavuwipesiw.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe300f2273---zixolabujorujisatasibi.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/pitarubemawakekufawexo.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/waxoxirofi.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/38591240844.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/xarevoxulutal.pdfIn PDF document text
    • https://clickbox.ro/images/file/7272632978.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/ferorigavofugejotifutagak.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/rivukuveviwig.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/37735314123.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/04be937e85ccaf8f9629a6d91d37ef9f/jibazazibuv.pdfIn PDF document text
    • http://gibson100.com/clients/870224/File/titotuzuketagovozawevob.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607483354d6ad---63330962244.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/bosawomesokiwud.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/48456325782.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=transition+words+4th+grade+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_off0000f433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF433 10860 bytes
SHA-256: 5d50d498b9a578c6fe03baf91eca3c711c955709dbdc26157640c1046eac5382
font_01_sfnt_off00010d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12534 18700 bytes
SHA-256: cd8f1f5a04ba4226933723ea63a4cab3d335c1d1051ec7ba60a7aa2b933c6ab3

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