Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f8ffaa0a1abe1b2…

MALICIOUS

PDF

86.6 KB Created: 2021-06-28 14:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 2a6166c6bdc19e48805fba0b3bdaf74b SHA-1: 2ba54cdcdbece0f632a110dc3fd50970f32576c1 SHA-256: 0f8ffaa0a1abe1b2ce1eb86e5bf6677c227b42114ee3c4bb9f3f37a25e29bf59
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The file's purpose is to lure users into clicking these links, which are designed to lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072d61d474f8---bukoxixanuperipatifed.pdf In PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757734bea61---90431741924.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/47050972592.pdfIn PDF document text
    • http://zxsolar.com/d/files/nosizejaru.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a08801cf78f---turixofiti.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/potiso.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/37342530399.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/b52e0e514b08f9ef3f3a3dde3c9ecc58/12304832909.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/xorak.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/jd3sqb8s29bl0f4j1eb7i3g2jj/vobaloka.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/67484a2afcabf2a68109bf8e0a6097ab/magarozebipu.pdfIn PDF document text
    • https://ksuskalology.com/images/file/gukagijesesetek.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f91aa75856---fudixijija.pdfIn PDF document text
    • http://beiks.info/public/file/fewusarusarudovafizu.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/e0a17423ef4344fab508bb8c3fb7de37/48380961366.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/69419360453.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/gatokexoteroz.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b3b560078---69608311330.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/duwizixumomuz.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c373600ee4a---13657271464.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/37399554694.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/vakejigojutamejiteturidaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=nichols+chart+in+control+systemPDF 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_off0000ee44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE44 10588 bytes
SHA-256: d99b842fde513e89b2d006f28ce03959e64ed63ee099ed17e273f13b163d3ec4
font_01_sfnt_off0001064e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064E 17656 bytes
SHA-256: e91a8461f171e7f8b4f8b5fe8a50753da53689877e441249375748fab6216945
font_02_sfnt_off00013522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13522 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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