Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df90ae1770142ad…

MALICIOUS

PDF

79.8 KB Created: 2021-09-05 18:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b8983582a7609a62642bb94b0ce368bd SHA-1: d377a080fa8249b80d473f7cd6a52d99b8b3b6e9 SHA-256: 3df90ae1770142ad16d134fec4ba2b26b7c0f5abe3ff2ba1852071b3c67fc60b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS uploads or disposable hosting. This pattern suggests an attempt to distribute malicious content or engage in SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nirkongrp.com/ckfinder/userfiles/files/judov.pdf In PDF document text
    • http://magooferta.pl/uploads/fck/file/vewajekaxigo.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c1ac57bb2---zufirusizipexixariduja.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/xovabanusubebuzenare.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/416565645d98787252c7ab2b166f2cec/91362043057.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e0de0363df5---63923819609.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/20384704907.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/54849543591.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/21900849594.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/dokujapezidakibaletil.pdfIn PDF document text
    • http://bienbao.net/uploads/files/16318751423.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/ridabigopugipoxalosozuw.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/vonogidoraro.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/15940377588.pdfIn PDF document text
    • https://bdcomunicazione.it/file/4128193082.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/3c2f4ce10a357f1cae5ebba4d305f00e/zuduraparuvepex.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082739b7d003---22356823112.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608918fedd182---fimovivadubepetuvizeko.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/98941622054.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210817061321_ogyur6.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099755dc0d45---32793042895.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/810f4p3mblrjb4nj4jk0tnn6vi/21472282383.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=soleus+dehumidifier+95+pint+manualPDF 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_off0000cfda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDA 18348 bytes
SHA-256: 7cf0517926ca6b272dd7e7d35e42d151ad1737b1ef5341a9c471e04d8ac54cfa
font_01_sfnt_off0000ff21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11738 11240 bytes
SHA-256: e4fe7408a5e5e1eb413218e26fc3ff513bf41338ef393c444b35912c4d05dcdb

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