Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d8dde2f1135b2c6…

MALICIOUS

PDF

84.3 KB Created: 2021-09-04 12:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 69cbce39350539e0f9a29b876df7aa88 SHA-1: 18839b9948601648c128530dc623e632060951dd SHA-256: 8d8dde2f1135b2c643788c6ff32c96a149dafbcd43fcf2f8a323dd12b0321370
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vralumni.com/clients/7/71/71e0d721b250bdad3664bf54e70089ab/File/nexefuzowub.pdf In PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/34531483403.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/51548629502.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c623b0ea17d---leponedujasapaxe.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/jafamitanimulasuzaga.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/82376072426.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b522f65fd0af0727a51e078cb85a5e58/pululu.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210829_95b50.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/t09joai9rtn4mk3g8i0f6hogu2/63831225551.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/pituzokifa.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/tiriborewosafe.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608433ad882dd---54600780467.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/93323121279.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/josiwosijakupejeredu.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609770f49fc79---pidojesawe.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/3oadhgqbnlm2rh6d5t0v1fcb2j/9271080687.pdfIn PDF document text
    • http://adveotec.com/img/file/71134259505.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/a9c1a798a89886be3c12fc9372e3a8f7/81534025730.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/viwatiwijuwibudi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=psikologi+humanisme+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_off0000e4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B5 10940 bytes
SHA-256: d561c63185bd9179f6d1badd22aea5a002b4750b83244415e1f0f85804055e16
font_01_sfnt_off0000fda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA2 17828 bytes
SHA-256: 12484de744141a37a9a2e265d0f28b52e21687bb2d1e887f034787d9c20bf8ea
font_02_sfnt_off00012bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1