Malicious PDF — malware analysis report

Static analysis result for SHA-256 9df322b7f57352c0…

MALICIOUS

PDF

100.1 KB Created: 2021-08-20 22:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e92ece9288d550ef75780e0e174dfc58 SHA-1: 984422ae9ec9b0026f306103b987cb763304e92f SHA-256: 9df322b7f57352c0e00178cda22f27a59620ffe68282d961353e0a8a9f2134f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pwr-tech.ru/userfiles/file/1150921579.pdf In PDF document text
    • http://montagnobozzone.it/userfiles/files/dupejagadetajivirexosadex.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/lefokimuxabem.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160706e835f2a9---vapunamalatos.pdfIn PDF document text
    • https://scriptdd.com/_file/file/22223300042.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1dcbac646---xatifenisadawiza.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1efaa1653---40792952270.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/1k01l6tjpl5fs044gkpum498s6/79202837098.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/favolutobu.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/42413950516.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a9f353c62---22404597960.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/givigazapilido.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/8ve4dd3ugahko4galihviqg5b0/71256493617.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/sotozo.pdfIn PDF document text
    • http://fitviewer.de/files/file/xewidelid.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9294cb674f---bawuwogagu.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1c5bdff85---81536573238.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/11610333870.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/17305741194.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaa0b04d92---38869944782.pdfIn PDF document text
    • http://transsnabstroy.com/userfiles/file/bovoki.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210819_C25F6F4105C1FACE.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/fda5ebbc93d04e721072a7924ede90ef/35300397934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=ver+pelicula+camino+hacia+el+terror+online+gratisPDF 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_off000122e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E4 17728 bytes
SHA-256: 8ac756319da26e0e1c428064e3e5b827b853d8c4f4e7891435249fe30b861235
font_01_sfnt_off00015006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15006 10892 bytes
SHA-256: 82eb33cf41afe13812dedd1bfde03c147e78341cee9d0c025df059aace741d39
font_02_sfnt_off00016907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16907 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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