Malicious PDF — malware analysis report

Static analysis result for SHA-256 57bc33f793b98002…

MALICIOUS

PDF

85.1 KB Created: 2021-08-20 13:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 6dd2fff487ab9df9c4f0e0591d300a7a SHA-1: 514ba67e6b702c24aa717502d3a272465e6e0fa6 SHA-256: 57bc33f793b980028257dcb9ff381e5ba4571ffa9763ea4d66ab0d49ad1e84f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting domains, suggesting it functions as a link farm. This pattern is often used for SEO manipulation or to redirect users to phishing sites or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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
  • 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://labotinnghia.com/img/files/pudopazumukaxepifotuw.pdf In PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607848e1ee518---51726369791.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/m295p6k3e3sbe621sb73e1j1b2/jonegeradokidu.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/fapegoruretomuze.pdfIn PDF document text
    • https://termoformat.md/img/files/41026244366.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/itoct93vh8b233befvdmlqij8j/sukofesumakegovepa.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/116ac38am36r775er4r851dat6/sumoziwiverusugexeb.pdfIn PDF document text
    • http://erdbau-rauch.at/zamufaxixililiwas.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/dejinadidobevatenanol.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/laveranuwamikeme.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/venezezasivinanumalutoku.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16271057234589.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/bogejedase.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/abb9788819e5ecd8fdbd3def4d1b3cf0/fexejizezado.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/83eeb3c69e190067a3f4be10771d8a1e/wogosusagututaniwepo.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/acd267ce48b3443fd5a563b7ac577810/5189299217.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/vunetupetowebikovizade.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/bec0b11794beb3e9d21418f8cdc1aec6/gofuzixitonit.pdfIn PDF document text
    • http://ymmicro.com/files/files/64417314123.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7e31a2b38---kazasifamujivusobuno.pdfIn PDF document text
    • http://axwelindia.com/uploads/bobudagegir.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097bc8047bae---rasapujabegekewajudoxexew.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b0428ea1e84---53192569404.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/bebuwutafomopag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=cartilla+aprender+a+leer+pdfPDF 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_off0000e6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B1 18356 bytes
SHA-256: 78c1ffaa30b11ed67c165786e5e2e92b9759729eea3588c783942b62c9e87f5b
font_01_sfnt_off0001158c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA3 10232 bytes
SHA-256: c273bc91c707fa73cd87e3f4b08748c5614d7aa60461780549f20bf6ed2012b2

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