Malicious PDF — malware analysis report

Static analysis result for SHA-256 8900bd2ef1adc179…

MALICIOUS

PDF

95.3 KB Created: 2021-09-16 21:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0a4aadad9a22bccb99ebbb5bec4c4387 SHA-1: fac0631e09dabe707761acdec1b6b24172de47c0 SHA-256: 8900bd2ef1adc1797d4a176e035a64b3f1b5f7078d6d56e1330a4f5ddc1150e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Several heuristics indicate the presence of link farms pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://luijkzonwering.nl/image/file/derupimefuwi.pdf In PDF document text
    • http://atletika-pardubice.cz/files/file/fugezelabokavab.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/4talocqc2v71vqp4uu1crlk71d/nuvafurezitagareradetuzu.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/19449904743.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/14099551873.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/2jb33amogtrpo0sgsofbl9pvms/90296047247.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142e994882cf---97404601315.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/7716225974.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/ruxutipenanopiw.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/20535653037.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210909182028.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/meluzomidegipokakovad.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/9f69d6bf7ea9dc584a90eac4813e09b8/gojori.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f436091078---golafabovu.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/rumezexafufi.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161424d61e5139---fitusenivikupuvabura.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/betitapixanefediz.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/daxusadoxesuvejobesekuko.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/53112915608.pdfIn PDF document text
    • http://abworder.com/uploads/files/zunakekajuvewebuw.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/gegozopewefawinilawuro.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/gorudem.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/26910863712.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/xujujegogeveromiw.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/furinuki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=download+3d+tennisPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9C 10400 bytes
SHA-256: 7262ac3559f537f29f920ce1dea9f65eb15add383c3027cff3ad0a481d024d6f
font_01_sfnt_off0001025d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6F 23776 bytes
SHA-256: 470faa7fb450e79a6b52bcdcfbc1ce4078c99b7efb6f168d42e28dfc28833770
font_03_sfnt_off000156d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156D4 16744 bytes
SHA-256: 2d8a152f315945592bda0509081eabc24feeb298ea1afea894d8b903ff0ebb4c

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