Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf54859ac1fca017…

MALICIOUS

PDF

72.0 KB Created: 2021-09-06 16:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 687fcb64be1e6b5c690b0e0c4c066d20 SHA-1: 69b17a275ee19a8df8b40ff4eaf99c65160e85cc SHA-256: bf54859ac1fca017de52b424f7f1148b743418445f2f3ca44c8c87604d25697f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm or phishing lure. The presence of embedded URLs and the PDF structure itself are indicative of an attempt to redirect users to malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/off1o2vf876plglvusn1s11h00/waxoritegojusegixudolurun.pdf In PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/talubazawemakijirubisoto.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b53155d3eb---lubov.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/p5jarlcrojdr6sjqgeucicus62/176444146.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/binoritotexili.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/f3c8eebacbfa66ba4b694ea9466e618e/lobagujanaj.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/jemupid.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/69325494914.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/9de434106b5f7f9cec8c0e6d393579ff/sebakasiz.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/52689067017.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/1241447945.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/93978301083.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/15797368476.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/22199934808.pdfIn PDF document text
    • http://ovodatar.hu/userfiles/file/24430983404.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/080eeb5a3e4cd8f74b5527859ef7a0c0/74980664031.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/da53e751626f4ceffd5d1c68c567f990/jipumemikuderojefi.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/43606cd8cda45e425d49e6dce2a9108f/62369836863.pdfIn PDF document text
    • https://apronorte.org.br/ckfinder/userfiles/files/59311841656.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/e8e41874d0f819a948bf8ca65f1db070/lezopopa.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/d1bd27a873ac9959bc49dfb4c7837337/49174843682.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/43288003746.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/lifuzanut.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/dul9016cb9dmjre3572qipkbp5/zipidotumaneparebunur.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/filive.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/78370129731.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/b8406a9c8c2f01a43c072dc037490ad1/pidexe.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/25105171551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=responsibility+of+production+manager+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_off0000b928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB928 14772 bytes
SHA-256: 1fb3585dfbf34ee7e4e010f71fee4abb4a9c8b2fa3c4dd1bafa36158c5183371
font_01_sfnt_off0000de08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE08 11360 bytes
SHA-256: e450626752f4685f6cc3fc0b85590691af6bbfc9647c20018a9ac033ee286518
font_02_sfnt_off0000f866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF866 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1