Malicious PDF — malware analysis report

Static analysis result for SHA-256 d92dcb09d0166a21…

MALICIOUS

PDF

71.1 KB Created: 2021-09-21 09:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 05fce2cca86e22e68ece99096a628d3b SHA-1: f1dceca7f7513d1828d4f1773857f80e01d3a400 SHA-256: d92dcb09d0166a21dd1662e0a841c9e5bf69fe8c76c7ec37d62d9d3c2e702188
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also features a link farm pointing to various domains, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of embedded JavaScript indicates an intent to execute code, likely to download further payloads or facilitate malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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 https://tranduongauto.com/app/webroot/files/images/pages/files/ponopetifafosijowefuroj.pdf In PDF document text
    • https://chrmglobal.com/userfiles/file/seboxibuk.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/lebosanog.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/c579cba8aafffdc03eb7d617313b6dee/kikube.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/baponugevetatapotogit.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/32407207640.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/nezej.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/limusanakinazajenixo.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/91835021934.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/42653763745.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210908103234_mbywuj.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/81986298108.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/fivitudowuzopamakuxa.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/80216913812.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2968dc888---wikunisavasuwupetoki.pdfIn PDF document text
    • http://albergocavour.com/userfiles/files/bewuputunalezigudi.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/67587317956.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/8e46882b6175e5cc420026b92fef7d28/21943842925.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/27957856196.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/19572517447.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/76036855148.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/razujixu.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405e4457ca7---wufumuzaxomanabujevekiti.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/sovave.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/saval.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=the+world+3+rise+of+demon+apkPDF 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_off0000b559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB559 10976 bytes
SHA-256: f85dbedb2cf15693234f9caa10f044a1f4bc7feba6c8b6cd5401a1e234236b3a
font_01_sfnt_off0000ceb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB9 15828 bytes
SHA-256: e5c6d48ed1bcec97d07f6e20ad3ddeab8e04b0e7b9d91875f1423e9899f1ee58
font_02_sfnt_off0000f700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF700 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1