Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b916778cbf1e9d…

MALICIOUS

PDF

76.9 KB Created: 2021-06-13 01:41:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: cd0d1a46824eaf4124f214b28777f3e9 SHA-1: bee2a5db5aa470e0f29c82560fec26ddacc826a7 SHA-256: 24b916778cbf1e9dee6d5461a958ea13b56187a42e8409b97bb5f0259a6f388f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to compromised websites, including WordPress upload storage, suggesting it is part of a link farm designed to distribute malicious content. The presence of a URL related to downloading cracked software indicates a phishing or malware distribution lure. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://inwebjor.ru/uplcv?utm_term=download+nfs+most+wanted+crack PDF link annotation
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/a101a090a281ccdac97e8218562e2afd/80113195254.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e29212fae---11925090970.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/sebalivapodeve.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/69b306ed13abeb2d7f5524cc4ac2e472/67322188995.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a250d5afa---jotojusodulekeraven.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/rilixolowodivazaxerijolo.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/e562b49e99480dd58d34729a1d3967cd/vunorixiji.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1871ecea6---45443531115.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/2qhsb4kl1kh5j2g1hjb39ul382/lijejetume.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/2497452032.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/verigomuwa.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/b577333ea1ba7106d0854db9d30d1553/daziwajonobo.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/metiramunawopefegezog.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/d98a0540ff7357d8dbadef7d801fd539/mosil.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/kezen.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a379919f625---13574936010.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dd8020cd6---jaredemokokolililawak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF10 5324 bytes
SHA-256: f90a765c10b3e7219dc65bc85bf2c12a01f5d994abecfb9c4f936b8298c5c7b9
font_01_sfnt_off00010130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10130 10988 bytes
SHA-256: 3b88611e694bfa9dea8b8a3805a7b5f67c98e5c3ec764753724adf4207882a59