Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ad8f9957d274424…

MALICIOUS

PDF

68.9 KB Created: 2021-09-19 01:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 492fe66dfbd25eb0322fcd773e15e9c1 SHA-1: 3a3550e1387f984d956cc590c83f864d443787af SHA-256: 1ad8f9957d27442407d94af2691f1bc21404b93748f4994011180d4a1fe8f2ec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, suggesting a phishing or redirection attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://kppzp.pl/userfiles/file/96176598319.pdf In PDF document text
    • https://mangallagn.com/images/file/dodib.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/zexokalegijede.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/77989738956.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/44275849578.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/7406355974.pdfIn PDF document text
    • http://uhorder.com/upload/files/15016358707.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/96065102276.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/11358651307.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fb95c8020---27082300184.pdfIn PDF document text
    • http://espwireless.net/uploads/file/xefovaxogeg.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/40350439913.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399af29e6c5---lugitibasowujasegakug.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/3788918119.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/turenenawuxat.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/gafokuxite.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/14978716582.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/74784064628.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdaab58bff---91424599390.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/60343017421.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/72571524865.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/fofazoxopukariwu.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/49512491435.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/xinepirekuxitip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=android+vs+linux+tvPDF 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_off0000b032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB032 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC849 10196 bytes
SHA-256: 09602da54c96a41f1f5a3b7e1125fa098d3da918b8080dcb1787aea86ad575c8
font_02_sfnt_off0000df43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF43 15592 bytes
SHA-256: eccdfd4c6873d1d618d3087730afccfaa342e5932131811690c39c8d8a13d291

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