Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3fc69815198ac1…

MALICIOUS

PDF

75.2 KB Created: 2021-09-07 15:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b9cad968f1788d75fb9cd38bae55cd64 SHA-1: d672e7937197398e427c3852c8be2d291780bd97 SHA-256: df3fc69815198ac179e9eb2d95abad66abc27048a3d9621446caba61c9a32808
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing malware. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://aeronautike.com/userfiles/file/mobajamaxufosiroraj.pdf In PDF document text
    • https://grandplaza.bg/uploads/assets/file/25389085772.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/e3ae974f0beb28be26df1c2a2999b051/padovegovenuzokari.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/vadizasexigitof.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160775be6e2d06---99660781912.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/nivexowejekujufunave.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/punabenewomebipobafufo.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/moviwisivesaselo.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/0ivik0nb2eomlfkm5pm0ol8pcp/gedexonese.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/98353576606.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/71102057283.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xabebedatijobiri.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/fuvinikezoxameme.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/lozolotuzekanisad.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073a37fcceb0---guwutefuvodawegimuxibet.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/85052716400.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/fabitawuwegadetepeko.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/gimafafefovezusav.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/pikatexalerag.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd668dc323---sozabibe.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/jaxoturirobudigiz.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/11276eb132307dcbf4cbd316ddb42d1b/zofobadiwabodulakogote.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160901bfe6159f---jabipezen.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608570b63851b---zujesusenoxezalaz.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/53558919509.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ashraful+hidaya+pdf+free+downloadPDF 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_off0000bd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD538 19068 bytes
SHA-256: d2362c4c024c4ab79b134eadb683311a14413b283d733e67c39abc6d8098a977
font_02_sfnt_off00010693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10693 10780 bytes
SHA-256: 2666cbcab09ea1505004b6b52538f447f6633f9bc1e5fcea8364d38852af9324

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