Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e704c48d7232fd8…

MALICIOUS

PDF

85.5 KB Created: 2021-07-03 05:34:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5847c02d43f8fc80261d81c5ace5b14f SHA-1: 51ece4016c86f8df2d84c571db9b88865e7e34fa SHA-256: 4e704c48d7232fd8460daa6ecf5c6d3676cd8bdb0555d554be5a57f743212b6f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms strongly suggests an attempt to lure users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://nomylo.ru/uplcv?utm_term=shape+of+you+mp4+song+download PDF link annotation
    • https://ajwatravel.com/wheelmarine/userfiles/file/jarike.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160970b62459f9---53888791038.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/sepixililaketidusixag.pdfIn PDF document text
    • http://mayfamilycircle.com/clients/5/53/53cd9f4101e72b768929e5daf979c2da/File/rurosowifutesi.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/tamewizadokinudilopanazi.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/30962740394.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/60594809073.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/pubosukeputibugozuvuweta.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/a78ae054d16b606989107fbf3a260af0/fimemi.pdfIn PDF document text
    • https://afayl.com/userfiles/file/75692532233.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c2eb5d42163---20214492027.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3912b1ee53861a6430b1a90b85891f0a/wixexuko.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/71137771276.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9c3f62965---20009727290.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098ba000a8b6---76155039936.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/6560220753.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/d09e182ccb022e6ef829aad51e2a9329/62257644109.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/k1m4akmsicdvbk484pmit70n27/vazenejesok.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/gowobibesizedixuvopeke.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/bigekigoxewunemabaxim.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/5q3m4175q460g8t88m1vttjp4m/24681333756.pdfIn PDF document text
    • http://stpatricksreunion.org/clients/84553/File/fulus.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/c60tfnoebtctu64ju3e6lau93o/86985937944.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ldekpcq4vvdlgfem3o8c5dle06/baxije.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/0o50hrdd4uid34qjm1s9iddut4/rusotetilu.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/5fa0e6be3a7894da8e5f848ebdc84e09/nezazab.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_off0000e8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F0 17472 bytes
SHA-256: de4d6d5605fac8c64269d7382bee385bed60c1345a952e8ba058e83b1a68db69
font_01_sfnt_off000116d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D1 11108 bytes
SHA-256: 9e577d2e98275b9036b26b177b6ced44bf1ee4830b9b183d5c8973ba7bfda465
font_02_sfnt_off0001307f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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