Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcad7bacb7c5c4e4…

MALICIOUS

PDF

71.2 KB Created: 2021-09-25 11:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 12c0b6d8447758a4418d8d4ddb3894fd SHA-1: d0e0ce102e2ab0ef2bac02690e81058f2c92a576 SHA-256: fcad7bacb7c5c4e4f988253eb809476dadce6db16ead97ef19c79cf7de25acd5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=snack+video+mod+apk+latest+version PDF link annotation
    • http://idolyokocho.com/js/ckfinder/userfiles/files/wagidoda.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614267e7df0e3---41974001669.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/24311545513.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/tidumumejizok.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/20589663291.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/gafogavokivifovi.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/bitomumanafufixazibu.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/10749576142.pdfIn PDF document text
    • http://futboltotal.net/images/files/mevemepeb.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/20768487583.pdfIn PDF document text
    • https://kysig.com/app/webroot/userfiles/files/62582714173.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/66776365676.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c9bc9147e---98947765204.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/pusukemodakejigujoso.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/besumad.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/23237172419.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/c1e5505b53b420f8983e175ac983c59b/fetegolugawos.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/46788450086.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/mexetaxik.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/gorudem.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/19955694529.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/kujulosalupebutibuwukuput.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/9793628476.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/fobedapiwuvipesojenawor.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_off0000b2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E9 16844 bytes
SHA-256: 022b1b0eaacda75119563268ce5babd7f54cae8c24731c901f4421edefb4a0b8
font_01_sfnt_off0000de13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE13 10908 bytes
SHA-256: b9daaab86976539f54421d616046454b1408dadb1137b007c5f49b73e31ead60
font_02_sfnt_off0000f74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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