Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd89c035ea5e888f…

MALICIOUS

PDF

78.7 KB Created: 2021-09-04 22:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d76b71d9b3de978209b697203d2e831c SHA-1: 5f2e666716935b5ce067902e97407ce6d48bff55 SHA-256: cd89c035ea5e888f4820893022db36908bfe331113e836e0a94e1309fa25c914
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with numerous URLs pointing to compromised WordPress sites and other domains, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://erdivigado.hu/userkepek/file/60763717432.pdf In PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611f8a2e25767---sikaw.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/femevafi.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/rupobija.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/vagikimidarubikaw.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b29c9d94465---36519774377.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/vuzuzodosejibeworituj.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7acaac4ac---ragivetikeropuzegarat.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/2e7929f73ebae1c88ac8724e729c796f/rifukatenifalewel.pdfIn PDF document text
    • https://keongracun.org/contents//files/budomusogaxoteraroxir.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/82608225269.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/melusupodes.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/15231244372.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/rubujexam.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd0e134bbb---tejozerukarajixebikije.pdfIn PDF document text
    • http://capital96.com/userfiles/file/jujixewiju.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/89760753288.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0d0741e8b70eb2fb4287ca57cfac158b/98851453028.pdfIn PDF document text
    • http://cartopack.be/Images/file/76567757490.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/44127591022.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/mexugivu.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2aeebd8457---45992871465.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608296827abf6---97948749017.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/bozusowuzagewukixul.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/49189738321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=relative+dating+activity+pdfPDF 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_off0000d067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD067 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87E 10632 bytes
SHA-256: 089a156023416fef4aca0d05c7a174226ae7136d6a1201a391e226ba82666fab
font_02_sfnt_off000100bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BD 17168 bytes
SHA-256: 75cbb68105a97434cbca89ba6e7d3ab99c1ae944624926287fffd753a8c41ed3

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