Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9683e37392bbcd6…

MALICIOUS

PDF

99.9 KB Created: 2021-08-14 06:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 40deb2098a000fbdfdb94467b0281823 SHA-1: 9d96851ba2fdb53b48d6e75a0c909ef8b1fdfe11 SHA-256: f9683e37392bbcd6a8c7b2ae16a2163805b5ad371b2c5f2d6d78c4e630feedaa
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malware or lead to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest the PDF is a lure, likely intended to trick users into downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://chcial.ru/uplcv?utm_term=cartan+structure+equations+example PDF link annotation
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094cae104db6---3992987194.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/96da5f8e547689a30232a231811167a0/sedifibafawurixisu.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/8pe08hjq5btqpfgmiss473n1t6/siniri.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/osst1blgl7s8hl3rd3ne8627u2/82985053227.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/3962d5b96b7eabb5830c3b746baebbc7/sajisozigupodajin.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/rugemawawibisoseze.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/tinanorugujetowufo.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/58033864819.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/94715003792.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/7875365753.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/ec940faa086ff9480b39bb9c5692dbd2/40030405774.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/saxefesuzerefo.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/vonowamarifu.pdfIn PDF document text
    • http://lagrupacio.cat/file/besimaxelip.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/41158465795.pdfIn PDF document text
    • https://birudongker.com/contents//files/5107690789.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/zugarot.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb45795bd5---depubavexotolidusofivala.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/f125b7ff9674ad17f59ff0097ae17068/baxufedokilaxew.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ee60ba4df---90633800582.pdfIn PDF document text
    • http://godswaynehemiahmbc.com/clients/878002/File/12247481153.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/zejeposorojimuzul.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863024942f2---50179801688.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/29f3f86608c6d1dc6b925028c3160d39/fobejigovodarelub.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/c5ktb4t5qg8lhitkud4mq4t23r/rofirozosapefiwativiwufi.pdfIn PDF document text
    • https://majubesar.info/contents//files/12537305754.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_off000120c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C0 18156 bytes
SHA-256: c160bb9e2973b5ecefb72a7f44b947fedc09bc31d3b62a49bb543c3d66194e5e
font_01_sfnt_off0001500f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1500F 10916 bytes
SHA-256: 59b24de79c6e14c6eabaabf5ed9498511977e888a014393af9a55ed75db5e988
font_02_sfnt_off0001695b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1695B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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