Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b87715e099aee48…

MALICIOUS

PDF

69.0 KB Created: 2021-09-05 08:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 98bd95722bd3ac1557dbf14862d650c3 SHA-1: 0ce2064f94dfc0603f3cb3f49989cead5b5bbaba SHA-256: 4b87715e099aee48304820aff3260b0cff8a329349f09bda9dc33bb7d83ec87a
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to potentially compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://toyotarenta.net/FileData/ckfinder/files/20210721_17053F5F25B22686.pdf In PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6416f13bc5---68077568490.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210827152424.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/gurobiliperevodedidibol.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/lixotudiwubupuvidesop.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/piramilezelimarikunot.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/34111205494.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfc7c6286a---dagazipeka.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/vebedusetoxegiroj.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/zepix.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/84258687440.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/mipesudatowibelejek.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/tetelenonozuxoso.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/61596462235.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/38275657731.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/5d034d0eb48c75e985fe26461ff15fab/winefojekepesekuv.pdfIn PDF document text
    • http://lobi.md/userfiles/file/98337618751.pdfIn PDF document text
    • https://soft-print.pl/app/webroot/media/files/bigebazozukemilawo.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/80062677086.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/41456338177.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cbdd7dd15---gegitin.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096465865dee---fagefud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=woodway+manual+treadmillPDF 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_off0000b3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B1 10536 bytes
SHA-256: 9e172a9a09e49477a12d983318f65ac904bb9924273afce4d650bf1a59c2de2a
font_01_sfnt_off0000cba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BA 14204 bytes
SHA-256: 1baae23d3631fd4a580ea2cbca37d39652bce2d89581a25a041b0577e899238c

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