Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ac38269250ae60…

MALICIOUS

PDF

74.2 KB Created: 2021-08-10 20:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d15e6101ac4f9fc1abf3f4da2fb5238e SHA-1: 112f13398b83e56700a780493ea92450cb64cda5 SHA-256: 71ac38269250ae604c5bf6f9d4490a451aa88f2daaa27970377261758f58763f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites hosted on disposable domains and potentially malicious WordPress uploads. The primary attack pattern involves luring users to these sites, which likely serve as phishing pages or downloaders for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb087a537c---wewidakodoxu.pdf In PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/15414938755.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/robudixisetiwo.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/xerawog.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bafc8402b23---75427498779.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/0cqi6kl9cgne8a7jqgqv388a05/buxuxiziwuvugawoz.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16081f0e5dda45---wojesibepatinivizulum.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/43659e8e20c5f08d70312e0895cc8159/24241922743.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/sulesapujesaxubomapikip.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/65372211306.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210605094144.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/4976a3qpd3asrp5pm5e5jpkfr0/peperozamagu.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/60242858042.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/nipadon.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/33e3762437989e64e3e4e3fdf6468186/61574844186.pdfIn PDF document text
    • http://coinmarketsuite.com/ckfinder/userfiles/files/boxewedevovivazuwikef.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/guvexovowumebixusux.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/aa73671b72bc23f8c9be6ce17313776e/52920746113.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/9r9796f4qtgg4mq0hqkdqj4dq7/jularito.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/74788142502.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/nimuva.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/4tjb2vgvlri35qmp4hphmdnja3/wuwutemimekopamerijudurax.pdfIn PDF document text
    • http://vo23.ru/upload/file/31184026424.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcdfb6a208---79847538208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=douglas+county+sheriff+arrest+recordsPDF 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_off0000bfab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAB 10968 bytes
SHA-256: b08a02035fa50df4967c587d3cfabd6845ed31df2ffe086e60f40ba358362e72
font_01_sfnt_off0000d8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FC 16052 bytes
SHA-256: b6da24dbf76e312bc24ea3fcb0d44ba1c41c480bdce546d9e30b6ac3660b1517