Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e292c50fc9c92e4…

MALICIOUS

PDF

69.1 KB Created: 2021-09-20 23:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4c2e823e1c97288e57cfcf0dc3e12acb SHA-1: df7257fabd2e5580ec6ddef7aff48075505f68f7 SHA-256: 4e292c50fc9c92e4cdddd9484b4f839bca0fc625ca97818f8ce085e453a848ce
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and ML classifiers. It contains numerous embedded URLs, many of which point to compromised WordPress uploads or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, suggesting the document's primary purpose is to distribute traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5231

Heuristics 5

  • 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
  • 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://hojoairport.com/images/file/mosogoxamugajukemirewe.pdf In PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/n263qg4gatcfvqd80ao750lph3/kebelir.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/55396711463.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/tigiligesifos.pdfIn PDF document text
    • https://funbugs.ie/files/file/pumebejimibev.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/zetezaditudatagodexajofa.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/1cr3so4865vo5lbgot1jstpt3l/84050631862.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/1449589807.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/navuguse.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/domoduvumoxuvig.pdfIn PDF document text
    • https://nusantarabet4d2.com/contents/files/7538718718.pdfIn PDF document text
    • https://sambelteri.com/contents/files/48221705718.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/xexuwasutigiwidetagofivez.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/a9a8061490361404cc305044a4ff9edd/25732986005.pdfIn PDF document text
    • http://www.pvvc.cz/files/jawadetisipiro.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/59841068063.pdfIn PDF document text
    • https://stvorki.ru/files/file/87339291811.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/narijivi.pdfIn PDF document text
    • http://pk.mo/userfiles/file/78155270777.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/72920587057.pdfIn PDF document text
    • http://rideco.hu/upload/file/xevutina.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/kkd424gjgmudhpb69omo588a4s/64938653755.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/jewefu.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/54666974020.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f92f1311d1---kisogidiviwexevali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=thor+ragnarok+full+movie+putlockerPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC211 10980 bytes
SHA-256: 963c9869fb3e04c3652d15be4e5b3c76c08ce96406c89021e53ca94acebb86b6
font_01_sfnt_off0000db6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1