Malicious PDF — malware analysis report

Static analysis result for SHA-256 36c7ba9932db527c…

MALICIOUS

PDF

156.5 KB Created: 2021-10-08 02:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1a4f5593d1a5d1ef71de106330cb4422 SHA-1: 428dab9d21884fa30ba51f577664912882b99c75 SHA-256: 36c7ba9932db527cb3fa511bba1eb70c0e799c5de89de283e09e34adfe639390
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fundacjahfg.pl/upload/file/xerokejixoxi.pdf In PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614c708a00238---16187679088.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/14493813526.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/duzagejevalubet.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/36999331765.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/zitejatubejojej.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/sivob.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/mejita.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/85056962577.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/pesawikegaxewinedasutini.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1615a528d0e692---karizuvulelovokiboxugulaj.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/libobunenirivukaz.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/fotojipabugot.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/45211673290.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/gagake.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1613334d05ea37---57959279950.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/gojadetonumero.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/34776734243.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/rewevireraripizasojubodu.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/93980272041.pdfIn PDF document text
    • https://oasis-travel.ro/files/2261036729.pdfIn PDF document text
    • http://suvenirzp.com/uploads/files/fusemunijajuzarufumo.pdfIn PDF document text
    • https://proxkimya.com/resimler/files/pinibek.pdfIn PDF document text
    • https://bdata.vn/upload/files/kanilajulomijexa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=shirley+maclaine+the+residentPDF 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_off0001f9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F9FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00021211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21211 10704 bytes
SHA-256: 2f6589efae9a2e9a0f904ba1225c7d98f2de97af1fe68d815ece9842281d92b7
font_02_sfnt_off00022a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22A6B 22108 bytes
SHA-256: da5b0b4f19412073a86bb97de39e27b80343df2fb8a97394132a0294d4f1fa73

Open this report in the interactive analyzer, or submit your own file for analysis.