Malicious PDF — malware analysis report

Static analysis result for SHA-256 3376138e81f4d03d…

MALICIOUS

PDF

76.4 KB Created: 2021-09-16 19:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9f6c29bdae9f5fe29777096bbc675416 SHA-1: 53db020e3bb8e37bc32d683440c81e2dd20bad00 SHA-256: 3376138e81f4d03dae9f5204db9437a5d0a93c2d4ae1641d2dae660fa6255234
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161331b1b8e4aa---vadugulolelawilax.pdf In PDF document text
    • http://elencostruzioni.it/userfiles/files/xefezezimudijape.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f71d7ea93---97426121614.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/sarupa.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/17111026543.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/44585784134.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/63797956985.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161316e0d533a4---79654535709.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/4225218617.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/91163574464.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7ea6e914f---42071816800.pdfIn PDF document text
    • http://myesen.life/userfiles/file/navalunelego.pdfIn PDF document text
    • https://razredna-nastava.net/files/12444112032.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/bepakulelejuzezurure.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/a72fcb1a8032466a2f66102d786cb6cf/61752118691.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/movisasa.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/77113344609.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/27511521302.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109011827123276.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/49538603659.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/598587e0e01cc753585d10910b9719c1/8715308014.pdfIn PDF document text
    • http://puisan.ru/uploads/file/zubesoboguvabegi.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161414eb0cfcbe---posaziremiketipujoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=h96+max+best+appsPDF 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_off0000c1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CE 19444 bytes
SHA-256: 27239877a96c51289361c88d75597213568751a6d84d04265b68152f146c2d3f
font_02_sfnt_off00010ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA3 10520 bytes
SHA-256: 60064759c33096c5336d5bd1898c8ff71f2bd126c88178a168fb59b8ebaf7108

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