Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c223b971d227338…

MALICIOUS

PDF

67.9 KB Created: 2021-09-16 06:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 383e5e76f5b810e0c66269d0b12e74ee SHA-1: 048ca04fe91c617de8e0268c604242b4d4a67c79 SHA-256: 9c223b971d227338e23ddcabf3e1dfbc70656ba81b6da70c0d23b14fe6040841
196 Risk Score

Malware Insights

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

This PDF file contains numerous links pointing to external resources, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a secondary payload via the embedded links. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/51890382175.pdf In PDF document text
    • https://woodfur.in/userfiles/file/75254957539.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613130c0b7d53---jogefubajujuveg.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/5244979814.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/39459224142.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/wixalejeweg.pdfIn PDF document text
    • http://www.andreapondika.cz/file/kufukubenozepivigu.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16139e9e6cbeda---paxuramodakos.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/i3sisj4tct6jrdpv8vrnfd2876/87666045393.pdfIn PDF document text
    • http://vo23.ru/upload/file/38571523901.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130498315718---dawegawika.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/10439252872.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/katejeponodemuviwidorulo.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/27375575032.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090318245773499.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/wumobemajovujojisibaluzox.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/sokutodosegi.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/35810128249.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/28095506526.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/tuzadipabunuzatefo.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/jokuzowuzizobozipetomug.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/86355373283.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=can+i+download+imessage+on+androidPDF 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_off0000ae81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC693 14340 bytes
SHA-256: 47f22a2ef1eaaa0a1d393bd00d5a8a9bacee6f95d688e2b5657f1a89267decf7
font_02_sfnt_off0000ea36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA36 10608 bytes
SHA-256: 49fdc0d6215b1410768c399a2a43ecbbeb0a9961389b7b7e1e2dcd56b7074e57

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