Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2f0da3f35785a23…

MALICIOUS

PDF

76.8 KB Created: 2021-10-10 16:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ed8a2b08cf69a152db33217623d8a5b0 SHA-1: d41bbc91becd563c85d2ec3ccd262cbc5e6febf6 SHA-256: e2f0da3f35785a23d0e72165ed34616d780e278411b16a1527f3f6f8b0aacf38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, with several pointing to compromised WordPress upload storage, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://hart-metale.pl/gimnazjum/userfiles/file/17488984770.pdf In PDF document text
    • http://apsons.eu/files/file/nufeloti.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/81724950968.pdfIn PDF document text
    • http://hasyo.net/files/file/julojubofexiwedigavirujif.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/56023833247.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/75830785144.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161338f9f5cb41---fiporuponezarekuxunejuk.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/73298148560.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/22682268939.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/89517665067.pdfIn PDF document text
    • http://sbkf.org/files/files/52286255830.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/puwemosexobosofojonuxadaz.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/nurusiwadonojipezujeda.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/lawuvuserixotolifuduvuzin.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16144f84793499---80164747348.pdfIn PDF document text
    • https://projetovm.com/uploads/files/60536805131.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153ea01a421f---76216102158.pdfIn PDF document text
    • http://robedecreateur.com/img/files/17971178746.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/63670582093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=long+to+hexPDF 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_off0000c471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC471 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC83 19984 bytes
SHA-256: 86a30b9b3b7e678f82adc045fcdd1753f6b16b525c3a0940cfa60b664fbc6368
font_02_sfnt_off000110f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F0 9880 bytes
SHA-256: d863cca8eb0a48b15ed21f28c5935a0488159819cea65b8de0f7bff5a9b1ad15