Malicious PDF — malware analysis report

Static analysis result for SHA-256 58c939365f555258…

MALICIOUS

PDF

95.3 KB Created: 2021-09-03 15:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0561bef096dcc2a008effd7accc93fe4 SHA-1: 431ced03614020540dde60857896dbf89c4904ee SHA-256: 58c939365f555258264e05579a7e12bd01d71999b010ca993886024d6e9fba4c
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm characteristics indicates an attempt to lead users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://inwebjor.ru/uplcv?utm_term=jurnal+karakteristik+dioda+pdf PDF link annotation
    • https://playworkspartnership.ca/sites/default/files/file/jowoxerefiperosokenegolo.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/81279488081.pdfIn PDF document text
    • https://motacademy.it/file/49089502606.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bbd95f349d---38015787634.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/dojiditozoxezuposedes.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/47719582835.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16123967f11490---62612775326.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609209046738b---wivarep.pdfIn PDF document text
    • http://ping-property.com/user_img/files/tutixamunegemode.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d794916002---wamebemakas.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/tivikexuvuwuxifi.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/fixidowudufurosogafupipa.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118099fdc826---44358748734.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9746a0783e---rudekuvevotabepilanam.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c284e7a0328---matasejebiragokiges.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/f10d98aa45906b48b29cadbadf6f9704/damekupeloli.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a882ab218aa---35702863938.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/75f41472b886f1c18ea5bf1fa86ccc37/pajagen.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/95843648219.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/qqklsdc4li5ni60g5bo280oonc/40312634679.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/f4b95e813784dc5f17ff0ca43aea8263/kuriro.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/59c5e2ee415162267c9ec98d06a494f7/76033311207.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/mapuzovujipewuzodeloxomif.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/41619062909.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/1093458424.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_off00010cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFD 10672 bytes
SHA-256: 3f64c1b11ac19ccb87f989c28345ec3bddc5d95d82ac19ac0d60c8670e710a2b
font_01_sfnt_off0001258b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258B 18820 bytes
SHA-256: 42473dd225123bc1f3413ec0da604f1c5e946de669113ccf37de8db3e2d8b1c3
font_02_sfnt_off00015766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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