Malicious PDF — malware analysis report

Static analysis result for SHA-256 341d45d4d0cbe658…

MALICIOUS

PDF

84.1 KB Created: 2021-07-06 22:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 200554913b4e0c0ab7343836b28d0b84 SHA-1: f1c920c2d721141ca9330e85320d06e1d67a8a3e SHA-256: 341d45d4d0cbe658b25a60243c862e919a2b225cba19def9c95adbb47981be73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/7gd9dbcgmctqe87s3v6l4jcrg2/loborixagubevu.pdf In PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a7ec69f43---saliwovulesoba.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/962f2cb25ec1da5b5fbdf6b13ccac6d8/59024126579.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/33064267631.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/85995657970.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/65666868274.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/lilutolibibowewiwil.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca02370f8c4---muzedijobuxenajotasuzifum.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088403e0cc1a---83047151341.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/1kqrduktpen3gkl08dsfh9crr9/lawewapo.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80e9c6e2bc---73923624205.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/eb3f1pfscr1opioleuc6lb1pf3/81268337812.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/rcp5p6l9d219bpeslu4c74iqhj/sefakamanupeside.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b54ce2c6eb0---godete.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8177a4dcd7---7686199296.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7367d44db---gexugakuniwumuzoliruma.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/xamuwonilukikifefegarupi.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/lizix.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070410628e83---95910088108.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/dagebig.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16082346b9359e---485503770.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae6f5b5272---17676783980.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/15624c0b50e5f9955735589ec85e1d88/41783746241.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+best+of+laptop+chip+level+repair+guide+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_off0000e3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CF 17396 bytes
SHA-256: 956788348555c88b5c27095aff3dcb0d37317d44e560742fdbf2836b1d0a2ccf
font_01_sfnt_off0001114b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12962 11064 bytes
SHA-256: 6fa7e606d94baa6b79d6e5617d50f13805a98484a77e87df4259b17eab1a29a6