Malicious PDF — malware analysis report

Static analysis result for SHA-256 561ba68dbb9719f8…

MALICIOUS

PDF

92.2 KB Created: 2021-06-30 09:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9b4333de20b4766356f8c5bae232cf70 SHA-1: c2bc0b897be2d1a72800bcb8218cb79b603c4cf5 SHA-256: 561ba68dbb9719f8cb3eb0165466e5b0032a4a7f101751f1de7f190dec886945
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for further exploitation or phishing. The presence of external URI and link farm heuristics supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://najlepsze-w-polsce.pl/uploads/20485921934.pdf In PDF document text
    • https://erdemlerkoleji.com/resimler/files/gegux.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/libotifojuf.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/87790830294.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949d05eb384---jatitedatadupolitizepaxi.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/44e076a74967198df0e2de5c12a7ca96/kikafudurase.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/nexegibawaxajepufirew.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/dutulalol.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fce9a1b6aa---82847351900.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/7um0aq64kgotbec8pqv8vav96k/6368871262.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/dixinapurufebumolavosef.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/sisezag.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/zakotoxaxunokuxelifure.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/nowazojifalinekejas.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/99205409868.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078a38eee02b---26345354632.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/1731f89b508f25b5ab0dff474cde8a5c/wigizodabovifatig.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/54675525842.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210623_C91BA0C2AB61CE6A.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/natomanip.pdfIn PDF document text
    • https://hgb.se/filer/file/46678371969.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecf0a75629---sumituzafufevonupat.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/i2166e43usoa48352vhdpi1lhh/fidofijazud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=new+fallout+game+2021PDF 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_off00010581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10581 10552 bytes
SHA-256: 56d03a3ac67bc0f2e8c49ee596dfd9e5e0e33a5a6ebdbf2dbf9376df9ce87372
font_01_sfnt_off00011dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCD 17436 bytes
SHA-256: 75d863dce718202ecba5c9ad32022b4c94e5ffce1c33b376302341259bedfde4
font_02_sfnt_off00014bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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