Malicious PDF — malware analysis report

Static analysis result for SHA-256 4976ba1f38a02186…

MALICIOUS

PDF

78.8 KB Created: 2021-09-05 00:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 234a13405d054dd646d05a4a8e1aec99 SHA-1: a9a4059b50793470ac9319ba1574e478e315b6ca SHA-256: 4976ba1f38a0218638baa11047f9a5d3c23ea93b247b31c1c1e92a5368904cc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate that the document is designed to redirect users to external malicious sites, likely for further exploitation.

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 https://catamma.ru/uplcv?utm_term=writing+academic+english+5th+edition+pdf PDF link annotation
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/51ab18e673cce5d9e9a0f4dc423ae143/79801551380.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/58531827191.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608072613dac8---xagalebubati.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/bj3ru5tmn97ig1kjpu0uthbp5g/gukerinefojipager.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bf0b66ba3---xitugi.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/nuduguwu.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/nimilovu.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608536ded8e21---buneviluguzifajolesipaxo.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160f794c6b7bfe---51886600915.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/rovew.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608164a9ea828---rizaxukuzemojopinodulef.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/vazedenubomilefepizi.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/wigaxisifipojixo.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/lutigekaripowedalobonexaf.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/tosozivamigavekoragodu.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/43344763491.pdfIn PDF document text
    • http://medrea.ru/upload/files/12503463734.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e28dbc9732---dotalazikama.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0210be66fb31e7a8a177e52e28017168/xisaluw.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/0d4766b7d0e1f3322f929fd7037f30ad/wafojolozagef.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/66283673498.pdfIn PDF document text
    • 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_off0000cd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD29 17940 bytes
SHA-256: fbd52861ca7a47bcf3f22af9e4ee7e5ffbd7b30e2193ce70e0cde028bf82097d
font_01_sfnt_off0000fb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB97 11196 bytes
SHA-256: 93162151536a4cb8a45c43f7f48a76d4846bb6e79b5eb17d64d039478046b84c
font_02_sfnt_off0001156e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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