Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c0bbd359e26ebbf…

MALICIOUS

PDF

85.0 KB Created: 2021-08-20 19:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1da664f6d1e26f8510068b4c89e56316 SHA-1: 9b5a21c3cb7c45654e0e5c2aad3a41480522b50f SHA-256: 2c0bbd359e26ebbf02dff564940b63e0d0ca65ab81b51f9dab179eb48c8bc1fe
96 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the PDF is a link farm on disposable hosting, likely for SEO manipulation or to distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/3dsjgallgqnq36n4krbvcs0to7/gosubomorobazaxaza.pdf In PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/xosaborolekiziwalixufogu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b3b958567---51768545680.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/8879968152.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/cb1e371973046d1acf0e57a59e437622/dejonibedenuruvuf.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/234f964ac109f154c11a5da2991730a8/pekurexinigiluf.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/8qghqnvvcuibbiabopgnv5ndgc/67181018241.pdfIn PDF document text
    • http://chichen.asia/ckfinder/userfiles/files/lugifunixukuwu.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a2ff49e72---binepilawi.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/dunulirenidote.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a527f007edb---rapiwemitiwapunizez.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/2cufj1njnhihkmjjqbsa18qof4/96365485996.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/kazatovoruduburoso.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/17087381819.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7832fbd7f8---lokireraxamobanim.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/ae997a4d91200f5dd754a28c77ca85b4/4836663722.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/6d861acec47524cf7a4e414fc9b1aaed/wugufonape.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/93991579373.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a1478466e---zapomikuxasubujere.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/dikelanefopolanama.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/bcc34dbf77c82ca2bd6411190457c9f8/56765893077.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f955243a99---71279478265.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f2538ae9473---68549302446.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/6f380590518686471e73647273411380/56659137233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=talk+like+ted+carmine+gallo+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_off0000e93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93B 16956 bytes
SHA-256: d84650a90acb37fe1aba8839d3004e322302471ad0dae8aa05d321dc2c5647af
font_01_sfnt_off00011519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11519 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D30 10852 bytes
SHA-256: 9471d8352b42956d4bb070c4d438755c1a23ec2dabd739aafa853fe0ba1b432e

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