Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ee30d59d3015f4…

MALICIOUS

PDF

88.7 KB Created: 2021-08-10 02:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ae893e38ef08e80067f9bd9a99630f6f SHA-1: df2250f27e47993daa651cf46c1d4c84f58f5a15 SHA-256: a9ee30d59d3015f4aeebd18cf675d62131379714519e306da964d0173f18aee3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDF files, many hosted on compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the nature of the links and the PDF structure point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://tremonttemplemacon.com/clients/862779/File/53721016362.pdf In PDF document text
    • http://vivaibonomo.it/userfiles/files/wojonagizopapozunatupopo.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/gulolutapiguwot.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021052695251_746723642.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/lezuvigupofivasaz.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/57047175653.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/63279598574.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/pedukud.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/b167d3ca1a28a4fbad5cae6ef4ebcb87/gizitamuwozapuj.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/40598561613.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/2e7b87f36975db97fd8ef1e08b7ad5e2/24077724254.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d324c2912d---papimononarafezu.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/fbvtq4svh1tugtt9a4ritojhp5/94815977495.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/66892570788.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/27477449905.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/17951994273.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/30717195484.pdfIn PDF document text
    • http://gerocuki.hu/user/file/siraludebunamazemi.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/aa263b37dafe61c51efb77cee5ec6867/rexosopove.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/modikogamafutotokilub.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/22094049587.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160de489668baf---gorul.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/92661049302.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb88ad152c---mutonun.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe75164b84---pepakisixolewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=clash+of+clans+hack+game+ios+downloadPDF 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_off0000f8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A8 10936 bytes
SHA-256: 094dd7d6462c478b99d45cdabca89c09584784c934ed8cfbf20455959c011547
font_01_sfnt_off000111ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AC 16748 bytes
SHA-256: f8c330c1081ad9f4f58c955ea7b32a9973b6870f9e683e86ce1a377a6ca5a2c1
font_02_sfnt_off00013c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1