Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd9abb91fcdc6521…

MALICIOUS

PDF

81.7 KB Created: 2021-09-08 14:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 6df5e886501de997a4fa647cf0380c38 SHA-1: 08f038421b8f73252a17d2f1e5f15d0950247f59 SHA-256: cd9abb91fcdc6521c9d34885dbe87f88f49a738f20543f3e638b5bfb6e23a748
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, embedding numerous URLs that point to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were directly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://crysiq.ru/uplcv?utm_term=suelo+limoso+pdf PDF link annotation
    • http://tindangnhadat.vn/upload/files/nilobenunuxafarukuj.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/womejesesunatulowetibe.pdfIn PDF document text
    • https://majubesar.net/contents/files/96228976451.pdfIn PDF document text
    • https://noventa.cz/media/files/file/92446449169.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/31317603759.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/66127960795.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/60185a0703283a1a90853c4ea38541c0/72372308539.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/72903038912.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/kuwamulumilojimag.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/durukanetoxojenewoxem.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/todekusuvu.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613264ceebf86---23415650302.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/vuxekakadon.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/47441049217.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/82756790060.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/9506f2766179d563df10ea4cb68f1261/61933462696.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/baf2fb86253b9aaa3a9c4a8b875da5a8/86357986125.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/xuxafejomi.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/34919724771858f6ce072fd54f2d68be/baferobejalawazajobek.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/37030905072.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/naxuse.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/jogixenirulibibumer.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16135b427980ed---26626848883.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/6119954061.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/vebuxozofowinizokonazoguw.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/gowebigoveled.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/wumivokux.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_off0000dad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD6 10368 bytes
SHA-256: 15efdae93b150bd962f31b2a45625b6707b64e7a4705036e0fa6695fefa99358
font_01_sfnt_off0000f236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF236 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A48 18368 bytes
SHA-256: 3ad41cf8be990d2c42ad2e31ff37add3bb7181506e82a2ef5ea8b4f11422b153

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