Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5b21d79c6139c3…

MALICIOUS

PDF

92.0 KB Created: 2021-07-27 10:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ec6a28611035bf71895e8fd25f46fd1b SHA-1: 4c7997a45b7375450ce7766291736edd4bf6d93f SHA-256: 7b5b21d79c6139c3074721bb533f6ba4d4326cbb7e0e3464b70d713878bac884
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious content or phish users. The PDF structure itself is also noted as having duplicate object bodies, which can be used for obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f247874f3e---60531729407.pdf In PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/63801306377.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/h3nrmnoaos1j4fliovq3e80e46/6966326401.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/hcmephspkr04jdeils0jfvrk35/58069765609.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/b0820ea12c54e2805ec37ba6caafbbbb/rolujaposepusowuk.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/rewubawizorikunidi.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/63959225585.pdfIn PDF document text
    • http://dzbnf.com/upload/file///kigakejarozubeki.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1485720070608a8df8e7f06.pdfIn PDF document text
    • http://sherylrobphotos.com/clients/56056/File/zaxuwobunopofupaxazanux.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/4bed078a687e597d3d7089cbd0922a8e/45286265154.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e9b8aeab9---73994055785.pdfIn PDF document text
    • https://proia.bg/userfiles/file/42610307107.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/fufovuzalizomotop.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/vunadozilobokok.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/c4640a72e179eb6b83757655e5f1f5ef/17931887885.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/widosugokajezufajov.pdfIn PDF document text
    • http://ogbchurch.com/clients/880797/File/zosejivilezezesezolavu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c3d84bc81---90220509909.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/bavatarakudiriviwib.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9d61808c8---pijepadesuxun.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/migeladixupi.pdfIn PDF document text
    • http://kbchina.de/upload/vurosadato.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/rikilotapofaxurijebitiniv.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/29910496413.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160efd7b608a53---jupediretozigedofifefur.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nilipubujuragonoguzidavaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=collection+science+water+cyclePDF 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_off000102fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FD 17332 bytes
SHA-256: 3cef8baa1ab4fec90ca884a14d1133e1d210ec5ae58724ee2c3b550f69f44ccb
font_01_sfnt_off0001306c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306C 10452 bytes
SHA-256: e5bd26930378ad4f0866f0ac2ae0003834c9ba16ef709075814d584439678ce4
font_02_sfnt_off00014863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14863 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1