Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f9c386a262cd42…

MALICIOUS

PDF

95.0 KB Created: 2021-09-05 02:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dca495cebbd66deec3ab35445af97a6f SHA-1: 1a549a3d065f5a6f979f843497b722542aba5219 SHA-256: c4f9c386a262cd4250356bd15993934b6ea2fcfea6cbc7a84ec058c6270bb2b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. The presence of 'utm_term' parameters in some URLs suggests an attempt at tracking or SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://wegofa.com/userfiles/file/lujuzofozasop.pdf In PDF document text
    • http://lorichphoto.com/pictures/file/39699118980.pdfIn PDF document text
    • http://strefa-fitness.pl//fckeditor/editor/filemanager/connectors/phpplikifile/36766956545.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086bcb310acc---warijojanemufanod.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/gajimebegobonodu.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd439f4b11a---fasexere.pdfIn PDF document text
    • http://simonide.org/userfiles/file/wetovukizoropuxajodur.pdfIn PDF document text
    • https://506hlapeta.com/files/file/76625466472.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3196120773---1023606582.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b090ff62f3d---xufojuripewuribafidej.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/vakegurarupenosas.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/pidero.pdfIn PDF document text
    • https://lecapsuledigian.it/file/dugepewepedinuliratasi.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/rajewibupesewofetirifo.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a8d61760d---lurunemililinotibewon.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116c7d0994ef---96072234572.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tusogogebekipozivinaja.pdfIn PDF document text
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/watunujikazaxosurupimuw.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/kiluvanetawasominu.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/lupuxof.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/78159063966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=skripsi+sastra+indonesia+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_off00010d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12582 19120 bytes
SHA-256: c8b7f094f994c16eb0f5bed107f39fc742628a2300b02565e5829e058d0786de
font_02_sfnt_off0001569b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1569B 10612 bytes
SHA-256: 1eb1c7df9b093cf71e9eff56b721a9f69ca80d76fc4f0eb50ab726542026c116

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