Malicious PDF — malware analysis report

Static analysis result for SHA-256 6543a3e63953fedb…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 11:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8834a65f5a2b553b45b7c8033f2cb2c3 SHA-1: 9464d2f9b0f6b4a686f71955262ee8c82d73c8db SHA-256: 6543a3e63953fedbb49333ac1ea87180227566042edf89c3c6197ae92d1c2f46
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous links, many of which point to external websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. The presence of multiple links on compromised or suspicious domains suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://pcparts.fr/ckfinder/userfiles/files/6208277273.pdf In PDF document text
    • http://grandviewgroupresort.com/upload/files/muzakiwepeke.pdfIn PDF document text
    • https://suncables.co/images/file/kunuwuxapuxukirupaxemugag.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/josuvedokepubobasekasudi.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161368261222a6---gagesuk.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/xaridodebamerake.pdfIn PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/kelokamezexo.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/zamakenenegosaruzo.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/takeve.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/1larl033julc58hbk5ka6erigp/69784882306.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/gigadesetemul.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/jarakodefugodepufutogiri.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/29931454212.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/68j3i05shl9ql1iiv6b862vqu0/90909555522.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/xupexelotijamepokulizefo.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/47522770802.pdfIn PDF document text
    • https://maurinet.com/userfiles/file/fetetimolobuzelozunevuw.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/20657996401.pdfIn PDF document text
    • https://mlspoland.co/files/file/29530931852.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/91746497816.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/21c69fe982009332952d47a97dc6d11e/sirobesuzusimimutudipu.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/14749323129.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/20166721583.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/padabubikafege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=livestrong+myplate+app+for+androidPDF 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_off0000d718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD718 10976 bytes
SHA-256: 0b11b88820181dc3b5855f574df1b46ded6ac052b22dc689baf61a501e69cf0b
font_01_sfnt_off0000f061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF061 18476 bytes
SHA-256: a647c212a6f94bcfa31ef1798be73c3b56f3eba1689aaeb9b1f169620712b1fa
font_02_sfnt_off00012060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12060 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1