Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac12b5ddcb90a540…

MALICIOUS

PDF

72.1 KB Created: 2021-09-23 08:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e23139fdb0c9af29bf0872c8ab28e881 SHA-1: a3c8c21a5c498ee4cb414e82de27ce2220805426 SHA-256: ac12b5ddcb90a5405b13dad3548cf9d3dea4e55ea2cfe6ff2c8ec1db701b9cd5
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 an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting. The document body is heavily obfuscated, but the presence of numerous external links suggests an attempt to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8257

Heuristics 5

  • 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
  • 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://vwtint.com/userData/board/file/88598389926.pdf In PDF document text
    • http://mnogonomerov.ru/uploads/file/30327158893.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/turosalikedixalirixora.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/82661403234.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/9ibqdrg5gj3trd9m0kpd9lvrif/53909190571.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2fded730a5004767ff1cbbc45edba2e2/jimamap.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/wiwuwafomoku.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/juvosekilisarusir.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/17020999151.pdfIn PDF document text
    • https://arerp.kr/data/file///21788511519.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/nofofidomer.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/rawogebimo.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/galugiw.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/84225352422.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140e9abd78aa---getebujozudi.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/83272088213.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/91460428817.pdfIn PDF document text
    • http://lovesenergy.nl/file/zojegatejaf.pdfIn PDF document text
    • https://nichebearing.leaddeehub.com/userfiles/files/xozolasukotetupupirebo.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/76655599571.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/3053220795.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/49431528297.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/34129605500.pdfIn PDF document text
    • http://feg.vn/uploads/files/zoduwakotojudopu.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/68172427271.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=sprinter+unblocked+weeblyPDF 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_off0000d71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF30 18128 bytes
SHA-256: 9222a05b9d41655145895ae5fdd39cc027e6d860555ce8814c2185435de77f0b

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