Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27e17ef9d056f2d…

MALICIOUS

PDF

87.5 KB Created: 2021-07-24 01:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 6adda54a9d6d0c6fbec1c4ceb6bc744f SHA-1: e2a317a29bd72ea24787b67f8dcbedb1b517f1da SHA-256: c27e17ef9d056f2d5bfb8f001b6833ac64f4a59cfcf985a83bb7ed26082bb2b0
156 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rgn2u.com/userfiles/files/70933916000.pdf In PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/84535925513.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/0394d3780bf64dc2c12f507d525aa88f/diwulenagigubapovi.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/5e09f6a32b553afeb58faaa2398adba5/dusufifevugejuxanimex.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/9c9c7a63fbdada556968a21ae375940f/jozozijinumun.pdfIn PDF document text
    • http://jucal.es/images/file/43382864602.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/dajokekisexowiv.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/kojapas.pdfIn PDF document text
    • http://houselandia.ru/files/tawamipomawubumebi.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609dae08190c9---lavafusozoresuvebesigugi.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/zufogivenakilodubuwuf.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad896477b55---44652238472.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/6606c26de7155312f16cf1a4c0ad4592/5400265613.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/5fjgsfumppfp84p46p8hb6n37v/35132638044.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/2a7bd0e25758d392267ab7c5a5314431/pumulezanu.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/wuvokudugolulavizidipive.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/19412878320.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/wunerisanudobugelip.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/widazabutekul.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091378724029---65680723627.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160832090674c8---logimixevaziforufaluro.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/eca471560e331dd343daaaac3229818b/bufozusetibimazeligab.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/a5e84004fede77998e76e02bc8bf2258/bapewobumarizofovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+load+staples+one+touch+staplerPDF 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_off0000f115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF115 17660 bytes
SHA-256: 8e68b1a015179c9406e27b6aa60c4f89f12eb53886156e49731b8a5581dbb9ab
font_01_sfnt_off00011f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001379e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379E 10696 bytes
SHA-256: 74a786074227ff82f837e858eebc17658d46e1b564e21a73fb00730378b6703a

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