Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c36e1603a8569f7…

MALICIOUS

PDF

86.0 KB Created: 2021-08-26 14:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7c7a4e021a1f1a61e6df413feb0747dc SHA-1: 794ff51162a5b861332a65a2a1e832e6a5779273 SHA-256: 9c36e1603a8569f72b9f6a80a52675bf7967030f525935351c7c00468b2c1b69
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. The primary purpose appears to be directing users to external sites, likely for phishing or malware distribution, leveraging a common tactic of using compromised legitimate infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bbf25aab6---mibojexil.pdf In PDF document text
    • https://299-45.com/CKEdit/upload/files/79738199576.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d96c2e0c482---17065647273.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d501c3345---mejiroriwujadunuxewaf.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160aad8dc21d15---bejoputafumimuxorofoxid.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/22468108994.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087fd433b55f---42741255417.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/r01dvaqad28fmcpk6fgqvj3a00/66139462066.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/12684430714.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/jefakowivajenevibavupelo.pdfIn PDF document text
    • https://electroagro.es/pub/files/3837688032.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/xijomuw.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adc96571df2---20384827446.pdfIn PDF document text
    • http://wwstationery.com/files/file/pufem.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/zozikupazixomikuzaze.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/a6a87610bf823baa42b5a7e5395a702d/987740048.pdfIn PDF document text
    • http://betalinktech.com/blmedia/file/fivomarenoleterob.pdfIn PDF document text
    • https://invest.pl/userfiles/file/94244053189.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/c93b0edfc2320b07bd9a68aefb87e138/sopunobax.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/05a75dee05f132da222e2c0f204f7c7d/rovoxiv.pdfIn PDF document text
    • https://orangerun.re/photo/files/nodugonusif.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/39524239090.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/fuwegubetusokawarovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=trout+fish+stockingPDF 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_off0000ed77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED77 17036 bytes
SHA-256: 086a3acab8a1c66c819113050880ba5a49453c64e32f53e52851087613bb726a
font_01_sfnt_off00011a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A32 10428 bytes
SHA-256: 16d82598ead7cd595acfd4e8a336ac57bac3126b27f8e88b92965a0953c933cf
font_02_sfnt_off000131d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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