Malicious PDF — malware analysis report

Static analysis result for SHA-256 570c32d1cea0ce42…

MALICIOUS

PDF

82.1 KB Created: 2021-09-26 00:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 44b713d6052e36f54ff5751f57b6493d SHA-1: f8bf98e106cba24978497b9f409c9e8354238e12 SHA-256: 570c32d1cea0ce421977aa33e9c8322df54312bf2a1fe6b6995059b9d783d525
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the document as a link farm designed to obscure its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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 https://medvor.ru/uplcv?utm_term=free+avatarify+app+for+android PDF link annotation
    • http://flairpens.ru/uploads/file/9093401544.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/70707104081.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/balomididajizorim.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/53603274387.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/96606414547.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/532864674.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/lopenokevalisadobidaba.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/wuxagekux.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/8ski97hqsuvhoh08dgmpl6tfcr/58075899912.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/vofado.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/74467346583.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/51620358157.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/37604396442.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cad22caa5d---lizofivukivumo.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/rovigekidumojemo.pdfIn PDF document text
    • https://carlojans.com/cms/file/fadugibub.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/84094137628.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/53356122874.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/gaxopijodidazewekuda.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/69372114427.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/dja96sdfg6egmea27ch07m2r42/4676171290.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f0b88c64e6---82285712934.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613f14b183c1a---mefon.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8e73939d4---68085187134.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/vovizigatoravenisu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD486 21696 bytes
SHA-256: 2e0bc159387067050b514e9bddda19226d251912bec2ec9b9a107bf94bf94f1b
font_02_sfnt_off00010c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C33 10432 bytes
SHA-256: 6ac52ad1df5dbe5e4efb3d262026d0ce52bfa53f44088f44fcc37e3232e9a2b2
font_03_sfnt_off000123f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F5 16188 bytes
SHA-256: 800554d3d6320da9c8ab21a3ad3d270f40e7a92360d7538c059d647d952d1d34

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