Malicious PDF — malware analysis report

Static analysis result for SHA-256 d64dda264c5b23dd…

MALICIOUS

PDF

89.6 KB Created: 2021-06-29 01:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6f95c12bce61e90071a242abd7dbf58f SHA-1: 0ba0524d57a7e586aaa3cc6510db89c137e16494 SHA-256: d64dda264c5b23dd57d7af844c760770611ee2e444804b024313f773dcf297f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm used for redirection. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to lead users to malicious content, likely a phishing page or a download for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://ahkjt.com/upfile/file/97660859169.pdf In PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/d3fc2f9579b4664967c4323f8da29f8f/44209135896.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/dudubojixotubadewu.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/lafatiw.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/7anjoss1fgpqn3p31e9cjasqq2/zuluzirikuzu.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/7406175274.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16096f69b136df---visuw.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/12325668722.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/f5b3510f3054657ba39815315e3eb587/janejafalasagalitisedu.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/vsk7epmuvv1bmu3oai70qbrvu4/zotiro.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/35959121485.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/d6a15df17b1d54a53ad8a0e356d2e0eb/13746981761.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/93529015012.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4f587b922---1778457446.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/a8a7233b90664541163d8dda2983831a/16780421956.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/96db346004566fdb5ee1d2871254bc24/xepuludofivajiw.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/1737513609.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-5/file/2021052221195873499.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc82f505203---kudezijilisozo.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d9b9a3c7816---loripimetejusuwo.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608365cd14944---34721247330.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/c42593e1ed5bcf65275cb24ee8e6ee93/52038150024.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087192236088---mefenasubobogemolejuxu.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/2361016404.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/mogosozime.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/11665099947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=3+types+of+meristematic+tissues+in+plantsPDF 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_off0000fc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC24 10932 bytes
SHA-256: e6b3b6003a0f3509525808280b0432f77e6d3643f90c4f98a41428b0207c4280
font_01_sfnt_off0001157f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157F 16588 bytes
SHA-256: 242df9c1db6fa02595b2fece26c334afe905b185b4a3ebe8212905f6a19e3c20
font_02_sfnt_off000140dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1