Malicious PDF — malware analysis report

Static analysis result for SHA-256 8487786f80122452…

MALICIOUS

PDF

91.5 KB Created: 2021-09-09 01:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 06591b30c43a494a1c61ef2d4baf1df8 SHA-1: 7ddb401423529498ac98ab3f5dfa95ef3024a9bb SHA-256: 8487786f80122452fb8a0ffcda72e3d0c9a20dc34bc93afef8f9eb2b0fc138ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics identified it as a link farm, with multiple URLs pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users. Although no scripts were directly extracted, the nature of the link farm and the PDF format itself often leverage embedded JavaScript for redirection or exploitation.

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 https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc491f2ef9---xujeres.pdf In PDF document text
    • http://sunpix.ru/img/lib/file/30687676033.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/nepuzalumozevegejeravifug.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/53857166418.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/gumupolepubipobizosibosow.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/karovafotav.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/bitoxolitekewedageber.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161377382499fb---kezenekejekesawanan.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/40586022716.pdfIn PDF document text
    • http://hrudolf.com/userfiles/jiwivupola.pdfIn PDF document text
    • http://ustunongel.com/image/files/baromokerewebavoruze.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/37414338223.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/dudagawabobojudiguta.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/mogijofavidakifi.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/duwugelokav.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132f4bd90678---jowumudapisage.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/sufopevejozemej.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161346a45859b5---xemadudik.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/uqqatvfuaqll34nrl8h4ff093m/98293794087.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/vifeludumevaxaw.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/fadadifebunutedaruk.pdfIn PDF document text
    • http://silver1979.com/upload/file/88125892570.pdfIn PDF document text
    • https://rafautama.com/uploads/file/fezifat.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/72697226112.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/29049672899.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+the+first+largest+country+in+the+worldPDF 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_off000100ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E0 17696 bytes
SHA-256: 699ca3ee2d29cb1f47ec3316f4356d629797283d83ccda67a8ba92c6b20b71db
font_02_sfnt_off0001469f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1469F 11048 bytes
SHA-256: 1802581ff83af3d65577dfb71a5ae69982fa7c0a4665a23c2a7b7b6b248bec06

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