Malicious PDF — malware analysis report

Static analysis result for SHA-256 5807b1ed0855f402…

MALICIOUS

PDF

90.6 KB Created: 2021-09-05 20:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1a2e73a5963e06f987c9a5f7427466cd SHA-1: 9137c9ccb9751836c96ab7d3f7f0940ae0d66f36 SHA-256: 5807b1ed0855f4029bb56bf82082b4c5c5c6df57d8c50b7a3dc72f2799559a7a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, characteristic of link farms used for SEO poisoning or phishing. The presence of these links suggests the document's primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://lws-realestate.com/userfiles/files/polovodiziwitofufegekam.pdf In PDF document text
    • http://smartvoicecom.com/userfiles/kunuxemuvawomivuzu.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/79830683123.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/kowovogutamamuwaxa.pdfIn PDF document text
    • https://samowar.me/upload/file/rakawutekubu.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/35356341022.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/v897bpcnv0cq66atq4285f5qd4/xedudebeg.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-25/20210525100157891075.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/dukavurugiwevexuvamopape.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/mo83g9lhpljp4eu6skca9as9lc/99833553820.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/8438142804.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/3327db51e234283a70441794c2139bfa/21424839379.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/sekodepisus.pdfIn PDF document text
    • http://dzbnf.com/upload/file///52094651510.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/a21855cab148ce3b0cc0ceb57e080ea6/vafogafemojufegiwaj.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/melubefovewesuwuvos.pdfIn PDF document text
    • https://atlantidegattico.it/file/51222961690.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e50af4f6ca---fuzakavarewakid.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/xujipefoziriru.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607400422ea5c---22731368769.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bf8f4073d---xegidupupadu.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/temepenawaraw.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/1s2876s887b04opqjbd29up194/gufuvosomisozofamunud.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/10319860105.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/80016009176.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=exercice+maths+ce2+pdfPDF 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_off0000f6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E8 20076 bytes
SHA-256: 5bfbcb4d2c5e00df1848ad27423a337148feaad2f410cb33507de2aa113145bc
font_01_sfnt_off00012a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14238 10820 bytes
SHA-256: b43f79c2ceb958adadb4cd6e3d37cb9e16345cdf85539c28b90302edddaefed4

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