Malicious PDF — malware analysis report

Static analysis result for SHA-256 75821ce4ac0c7fa2…

MALICIOUS

PDF

84.0 KB Created: 2021-09-16 13:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 366f29b94ed30765789713f113048cc2 SHA-1: d5a4883b98f4033d6d391fd896c0b5615b3fb0fa SHA-256: 75821ce4ac0c7fa2e8961813292f2f830decefa8b7fa9915d96708c6612de131
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristic analysis revealed that the PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution lure. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://crysiq.ru/uplcv?utm_term=no+cd+hack+ml+apk PDF link annotation
    • http://texinpack.com/uploadfile/file///2021091400011221.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/1bfa7281ce203e8da317ba6c779a5f80/14794483762.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/24418699158.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/12461619896.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/gorekave.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/7624728472.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386b93a5e67---fajoxabinevufekugekemox.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/potivowibuxojakejalukivam.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/fejuzasuzibunelotu.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/ravamodosetokejir.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355c84273f7---15592998156.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/wuvuvoromolovirax.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/rudarezobozaxijofamuxab.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/59884694066.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/vulaz.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/fface065410c971d444f11d32b7aeab9/38944193746.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/71188327272.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/8842869466.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/4s9gu8kitf0n50n6pq0h63bs63/fudirotabakiwonebi.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/78638434219.pdfIn PDF document text
    • http://toroisg.com/public/images/files/59246321392.pdfIn PDF document text
    • http://www.bash.cl/media/file/34455045411.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/1ea61948d1684b1a702a3e480808b022/3812275897.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/8594d851f49d30d285e61aa95d6a84c4/jotukoxivubuto.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/melirebipuvizaz.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/11488612120.pdfIn PDF document text
    • 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_off0000ddb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C9 10156 bytes
SHA-256: b6b8dffb989ccfe1eaa3ea929e913a3602e4386748c6fa1aa9072e3c622fe488
font_02_sfnt_off00010c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C71 20580 bytes
SHA-256: d432016429f9966734657cf056aab7de7f038e09e3e30591a23b7a4ebbdc65b9