Malicious PDF — malware analysis report

Static analysis result for SHA-256 33944b578ecad4c1…

MALICIOUS

PDF

80.0 KB Created: 2021-09-11 17:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bcab97cec31cb9e9774caf95aa650398 SHA-1: 7e8cb421b2b21e983cf1c5a450bcf0d4169664b1 SHA-256: 33944b578ecad4c1ef7071994a00202ef682a3a124d8c379f6afdace6c21591a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised WordPress upload directories and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://irlanc.ru/uplcv?utm_term=the+hacker+playbook+4+pdf PDF link annotation
    • https://agros.net/uploads/file/48360209014.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca0f38365b---28877112551.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/17704980668.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131dc618a3cc---wunile.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/kimororejozinurenikiponu.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/59918906837.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/7d7feb0890946ea6c9f96f4ca5758d22/nalikujujilif.pdfIn PDF document text
    • https://nobelboya.com/userfiles/file/28962627662.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/wovaki.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/lusag.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/97245456732.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1612eec83789f5---viwunotul.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/48691292651.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/83a0qo1mfosdo3vavijpp435j3/nuxafet.pdfIn PDF document text
    • https://simorgh.it/uploads/file/44374053490.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b90de93f5d---57758717240.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/82477847735.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/wuzusujabevobimom.pdfIn PDF document text
    • https://mattress-leader.com/media/mezuwefeli.pdfIn PDF document text
    • http://topstec.com/d/files/xipodukuvakumuvob.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/34203480479.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345012d7823---relisogixelofuviramamad.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/wizomexigu.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6a077d41b---kovewumofewi.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_off0000d1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EB 18116 bytes
SHA-256: 605b9206494cc54f491037984e882e2753f254a6bc131cabd6fb755e07ad13af
font_01_sfnt_off000101ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AC 10640 bytes
SHA-256: 9767651d60cd8358edc11a710dc6209f7994148ac60302d822a811b77b0fd878
font_02_sfnt_off000119fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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