Malicious PDF — malware analysis report

Static analysis result for SHA-256 c485e3a56bfe6fee…

MALICIOUS

PDF

81.0 KB Created: 2021-09-04 02:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e4e85591221b2a11399fcb43d27408ba SHA-1: 569e6236225e4e70516f84138b5715384651a1c5 SHA-256: c485e3a56bfe6fee6cee4630a3eef4f708b3eb4a60ff20a93db455af614fe9a9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, with the links likely serving as the primary attack vector to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=7+digit+place+value+worksheets PDF link annotation
    • http://kvbm.org/pds/userfiles/files/wabexabu.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/a06bad67a9a004fd02258cd62a28263a/nediboxamapafe.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/37603765608.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/femokujon.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/bofekifitibadilojilige.pdfIn PDF document text
    • https://fallsplat.se/file/negejuzuvevesagifizaf.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/jidixolepixofirurawe.pdfIn PDF document text
    • https://tcremich.lu/files/files/93836262105.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/nebofupegilevomu.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/bexemifajisovoxomadinavul.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/fatutofixufejavatat.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce9cb40f95---kogufumobanisadafije.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210725_174724.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/eg69q85ietkuq73hbtjlfk93l8/gabewetu.pdfIn PDF document text
    • https://themalc.org/files/file/32576398894.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a600f7aacf8---nazeduresebovenoten.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/78190440942.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/folafexejusolugonox.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/reziduwesazipegarubujo.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a04d984c45---54261576510.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/80495636271.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/fudulo.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc613c6186---rowujufefiselezifabi.pdfIn PDF document text
    • http://rld-carbon.ru/file/gosix.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_off0000d5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F7 18004 bytes
SHA-256: 65d20821041705db69a4bd90ff900ad7ccc6859da51468477c9cf33c76d6d431
font_01_sfnt_off000104d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D4 10988 bytes
SHA-256: 20486d6e928f1c74289f95a6ae7a6ee85323ed9a00e748fc1ac1a6a1618316eb
font_02_sfnt_off00011e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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