Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8682f6a323e7b1…

MALICIOUS

PDF

86.7 KB Created: 2021-09-17 13:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4af779f3f47ae127e8022c42ae404079 SHA-1: 130d5ab165259d89085276c49f741373410a747c SHA-256: df8682f6a323e7b1faf3af83cb41b544abb73aafe5aba928ae0467b83452adfc
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm suggests an attempt to obscure the ultimate destination or to leverage SEO poisoning.

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://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/k020ur9vbe3s31vi3tccs6b2l1/13279821701.pdf In PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/41300050434.pdfIn PDF document text
    • https://kmedebiyatgunleri.com/ckfinder/userfiles/files/36191874408.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161349f07bc4d8---zuguxorujevevukag.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/wonokosugojitoluzedebusab.pdfIn PDF document text
    • http://herbexindia.com/ckfinder/userfiles/files/37255337940.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/soxadanovusufasuvazo.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16134ddd97c64a---lesisizoteluvek.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e07a429a68---jajabojunom.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/63498381042.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/48541390930.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/mabajejaze.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/lanijabe.pdfIn PDF document text
    • https://el-tall.pl/pics/file/67765997784.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/41856928878.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/24915476191.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/galunimilofedaletaf.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/9921974973.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/43339239351.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c824cff65---fotevogano.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347aa96a815---23539578489.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/losusuragawanuvex.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/16919895922.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/24707209261.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/xefuwogarixepoxabo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=android+9+format+sd+cardPDF 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_off0000ea0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0D 19556 bytes
SHA-256: 47467c32895f7dea6d8e453d5341d9b8669f18c60ced1617f52e3dca8e26674e
font_01_sfnt_off00011cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134EF 10608 bytes
SHA-256: 364f085ad76d31e6110ce785402742026e6a47f072801c10cbe8e8bc7f60015f

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