Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d66985c1ae26387…

MALICIOUS

PDF

72.5 KB Created: 2021-09-17 06:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: affba69cc29e9104b34e1754cd645f06 SHA-1: 71f0e4025b73d5047b6353abd20e81ba668d0e80 SHA-256: 3d66985c1ae26387cc6763d1054f27c748ed0bb12f3d90d3ca339d1ed28d29e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.vishalsahni.com/public/ckfinder/userfiles/files/96702655611.pdf In PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/pazifez.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/xorezikewed.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/93864054674.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/065e84db89ec7fccad2ff91f8da09bcc/zuboxodeduril.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/tenupatirabinulujifugor.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/40725589137.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/dubanoxi.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/borerixalitemupanixoluzus.pdfIn PDF document text
    • http://jadeite.ru/images/file/foxarimagoramotav.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/gudusiruzobesir.pdfIn PDF document text
    • https://uzsienis.cvzona.lt/resources/img/files/15588278206.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/zejusanodize.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/62610851405.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/24069535833.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/1666813584f3d6e8bed47194fc777ad4/17268281698.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/pirolojaresusitufoxibulu.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/36703649320.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/64635719988.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/82762663552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=cara+menggunakan+google+drive+di+hp+androidPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/5aa0df6d152260ec7e72e65682282161/65681732600.pdfIn PDF document text
    • 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_off0000b854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB854 10864 bytes
SHA-256: 6686c60a2057d58de5f06cab3367253eec54420df7f8bd841d77498ced0b549b
font_01_sfnt_off0000d0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE905 16992 bytes
SHA-256: ece3839b5da47117929d1bc275bf9fc18e3aa36fbc04c44c530d75f2d8fb796e