Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5987fda5c43795b…

MALICIOUS

PDF

92.7 KB Created: 2021-10-10 01:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 64ae4cebe2dc41d9bce8e2c51dfb0212 SHA-1: ca27dc2c0402db205b8583aa662e632bb087835b SHA-256: e5987fda5c43795b136fa70f1c2cdef4459656d1d32eee023ec9cb150ecdee5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and a link farm heuristic points towards an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://provia-events.de/pics/fotos/1/file/54341306453.pdf In PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16155b98828629---32745676094.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/liwaziponodepenogovoze.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/dofirigogozupidelexi.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/68710382571.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/famowupotuwon.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/22217909957.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/9tfvaaf9ajbjao3b6pq18mmun5/vegopof.pdfIn PDF document text
    • http://seamacros.com/upload/file/33303334326.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/silozifesiwekikelivejases.pdfIn PDF document text
    • http://orthodoxnews.us/file/49216012892.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614076ed0132b---33139553823.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/10035454989.pdfIn PDF document text
    • http://quetthe.com/upload/files/35050022937.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/71411491966.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/binugibomoxit.pdfIn PDF document text
    • https://whitesal.com/data/images/file/3669_20211009130910.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/73104412752.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/53111773698.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/68109693573.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/finofuposejezan.pdfIn PDF document text
    • http://goodslib.com/userfiles/file/11450292529.pdfIn PDF document text
    • https://matratva.in/userfiles/file/49575660306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=walking+and+leaping+and+praising+godPDF 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_off00010158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10158 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001196a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196A 19940 bytes
SHA-256: cd5d1b2228737847dc6fed48c3b31325dc9365e9680aa6c7aa91155d2620d270
font_02_sfnt_off00014d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D23 10552 bytes
SHA-256: 5a6cc93f3ad00bab8e6a9e024826fc8f60a5c8595d8146927694c86363259a42