Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a6e98bddce7511…

MALICIOUS

PDF

73.5 KB Created: 2021-06-09 19:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e3d2b76178001f0ee094b0f085c0543b SHA-1: ffcdf16c8f535121beb061ad6782c6783613c1ee SHA-256: f6a6e98bddce751194d6220473e0a7c728f2bd805643364c7dc0757aa72cfd70
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and ClamAV, indicating it is a phishing or trojan distribution attempt. The document contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users with a fake free download, likely leading to the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://philabc.ru/uplcv?utm_term=top+notch+3+third+edition+pdf+free+download PDF link annotation
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607eba0db4529---8187772083.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/91914219525.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a561576ee10---29854570020.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210609052303.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/6a3ba145b4716b4775b1695ae7921b1f/feniwoxupi.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/61327766238.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/duzopogudugogapezotez.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef53d79c16---xovenibikifaxaral.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070b14f4ed09---7109199694.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/75197213372.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/33490548790.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6240b99cbb---67153975633.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/5603527582.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/21272004225.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/dozolomoxupalojusakotawo.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/i51bhu80jnrbpsu0bbp0d8bj6e/vofezadaradir.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_off0000dbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF8 5272 bytes
SHA-256: c77ad7266a18eb4df20a2a993e09595540e8711495330104c67f3617e93e8bc9
font_01_sfnt_off0000edf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF5 13584 bytes
SHA-256: 4a480e0e88dfadb8d3efd1a9557122660d9ef15073af09c4ba69e4f771f925f0