Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aca4670434d0fc5…

MALICIOUS

PDF

69.9 KB Created: 2021-06-21 12:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d233d7020f72b1ae83c266971e904c57 SHA-1: 17f91511d48770ef58951eaed45867f6b3dd2de9 SHA-256: 6aca4670434d0fc5914a03579b17c743702b1a6f711c25d81d0c6dd2ec26af81
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of external URIs and the PDF structure itself are indicative of a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=aye+dil+laya+bahar+mp3+song+download PDF link annotation
    • https://nhachoxebus.com/upload/fck/file/juzozukekibetiwakadukus.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/eaeb00b64bd10700fcf603d071e5285b/49880225971.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606d522e26246---voxutibesimume.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608229097cd22---75830624469.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607919ae36f89---56863864998.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ad5ce61d9---wagapevinurida.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/62016928936.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/83135372829.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160720d5807bd6---divoliremuxuminaz.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/wejofifevivedagoja.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/84198403235.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/bddc310c2829d4a85f07f2db44b52207/daduvunakonopal.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/jokaxewex.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b27388164---7632707520.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/mopija.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37C 4060 bytes
SHA-256: c38eb966ff02dd7ba6021f2ea347d9b79c71e3792f9adeb5227a7ba17b0a5dfc
font_01_sfnt_off0000c1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1BB 5568 bytes
SHA-256: 8b19b2a9647d9250dacb070ac015e6775d14f89ebf178219683580edaeebed85
font_02_sfnt_off0000d47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47E 12448 bytes
SHA-256: 3596850065229802fae55b9e08d1f446c57e590c359de26388c9511140229a58
font_03_sfnt_off0000fc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0C 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378