Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd658793176b94d2…

MALICIOUS

PDF

84.8 KB Created: 2021-09-07 00:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ae30c135c575a9afe642a37f6e82a8fd SHA-1: bdd0895748a9fc319856e1385a165029a2528b13 SHA-256: dd658793176b94d21ac619d625bade39f42fe4400bdb42544450cec05d8e6154
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, hosting numerous links on compromised WordPress sites that redirect to other PDF files. These secondary PDFs are also hosted on potentially compromised or disposable domains, suggesting a multi-stage redirection scheme likely intended to obscure the ultimate malicious destination or to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/d5168a8a97eaa14c941e3cccbbce1a87/zifedorapuxajeb.pdf In PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/bdf763bbc2b23220cace08e5ac313111/55763400950.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210502171406.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee214645af9---55108225781.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa380f234f---rarusizupuwojisojas.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/voxebofenuk.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612924ef6b7a7---22966462415.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/81113429471.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/1750f305143f7806d7fdbe5be11fcf7b/rikomagop.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/xoninutomofisumigubimokig.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/sukegenedikubiluwosobibe.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/94231327635.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/tivemejovezomemi.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/tosoboxobi.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/rasosizujoxabufefu.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/13042415197.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/ribaxirivekon.pdfIn PDF document text
    • http://yuhongzg.com/d/files/9992531404.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/lakijotumofobimuval.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/p25mbf9lenpcehhg1haulgpnq8/topoxodirudol.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/60222944141.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/jufezufo.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/79940798287.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/s6or291k4aejp8j0n7nbqftj2t/gumix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=business+law+kenneth+w+clarkson+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55f449c060---zawisefe.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_off0000e0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CD 11048 bytes
SHA-256: 1cd8a0beb479bbee2ca5fb72ef3aa75f735fcf4f717d3d850688d85f23a2d0ef
font_02_sfnt_off0001128d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128D 19180 bytes
SHA-256: d1b7a976afb2805fb1882d39c38fc9c8154f44338f4d326863b863ed92208df9

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