Malicious PDF — malware analysis report

Static analysis result for SHA-256 99dbae647d26f372…

MALICIOUS

PDF

73.7 KB Created: 2021-09-06 08:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 81ffb4198c6965417b516d36fbd0bb62 SHA-1: 7eb61562427f494b2151f3468e466b5914182e21 SHA-256: 99dbae647d26f37295c6b8c388967b9d1dc4f65d02dd83c1c7dffdb6439fbacc
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it is used to redirect users to malicious content or phishing pages. The PDF's structure and the presence of multiple external URIs strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=measuring+with+a+ruler+worksheets+inches PDF link annotation
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160739c48da8f1---nakafokazikuxogokusu.pdfIn PDF document text
    • https://postelezmasivu-plzen.cz/ckfinder/userfiles/files/33254200551.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/65169730153.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/orcnutara92vi7hi5sd9pg38gm/gometuxefijuvegixekoja.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123c33cb1719---fazanemekogadinavix.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/97999430752.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/98674320508.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/negalavivufila.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/32a2fe668a9d0e76c12329e669b25b6e/65723927454.pdfIn PDF document text
    • https://krono-original.vn/Images_upload/files/kumogulizajuxepo.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/a0b3052c5ffa17562ea2e64eb09cbe5d/3802752927.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/3fkneilhs18lqmg1qaqn7ih5i7/6545659387.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/22963237978.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c47fd6a4ce---72212077177.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/13865158110.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/8cbd5f39f5100aebd49669b1acac3f18/22746659853.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/89406471021.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/89458555347.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d813a9f71---zefopape.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/firuxuwevorewamejudi.pdfIn PDF document text
    • http://dzbnf.com/upload/file///37998131368.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/acd5d44aa12b2a325e6e901ef347e5ad/90699677492.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119e074b3842---59220202773.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/86475780004.pdfIn 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://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_off0000bec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC8 10780 bytes
SHA-256: 737933f5b0a003533206a2578584c8332a630de40ab53a94de5108d20c8030f1
font_01_sfnt_off0000d7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB3 15884 bytes
SHA-256: 2ef5d92d0ae34d25714c634e1521a9dcd89340116299b8df530300cb1e9319fd

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