Malicious PDF — malware analysis report

Static analysis result for SHA-256 69410890b8c4a48d…

MALICIOUS

PDF

84.3 KB Created: 2021-08-16 10:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 078ad3d102e2429c5100256fff13eb59 SHA-1: 81a404843e944fb201156287ac1a998b12b118ac SHA-256: 69410890b8c4a48d84ee60e74bc61970f7966d0fd665bba993673cc60b7243ce
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This structure suggests an attempt to obscure the final destination and potentially distribute phishing content or malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/416c698e4392a5e1ffd7de617440015a/13032987854.pdf In PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/nowusi.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/wizedowuzidudebovomovex.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/80913815402.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/nrl2vooa3scfhm87va4bt6i4d5/39399420145.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/78476703425.pdfIn PDF document text
    • http://e-hematologica.com/users//file/xexelugukenifiwij.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/1e0168924bde5e48ea357675505e2046/jogaf.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/9c9a11ec0a251daba9a7fd4a6a8501e0/62839802396.pdfIn PDF document text
    • https://menu2uplus.com/images/file/lovozexawogimox.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/1utl0ovjg255s0agh5sdaps067/50686413680.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/tuwivog.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d18105157e---nanalodaga.pdfIn PDF document text
    • http://hutergroup.de/userfiles/file/tufosan.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/21522105993.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/pm98e3cvdarn44dl7evf195n9u/taxogobirisuseza.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/powefigowojinu.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ffc8b7877ec---25961042928.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/nifisusexezo.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a013fab32da---borawugigerez.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/firexa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0511ce1c9c---wonamulirolepufatekugibu.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/41784702603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=minecraft+bed+wars+free+playPDF 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_off0000e49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49D 10828 bytes
SHA-256: e23fb33d296af2bd1f5aa6a1b59d7db14e0f178d01a06422377a750e52c971b0
font_01_sfnt_off0000fd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8E 17200 bytes
SHA-256: 7803728da412a8acc5895be69205db472de707abb7f733cd1df9953de9c639be
font_02_sfnt_off00012a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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