Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a5615e39862e638…

MALICIOUS

PDF

89.3 KB Created: 2021-08-16 23:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 10d5df7a260dc8ea99429035b745f770 SHA-1: 042f51c5dcfed285d5a57a4725b8690f7d16f0f4 SHA-256: 3a5615e39862e638a901334c00fb9a11b05488dc9afff140f2a3b40115dbed79
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_MFA_LURE' heuristic strongly suggests the document is designed to harvest credentials by impersonating a service that requires multi-factor authentication confirmation. Numerous URLs were extracted, many pointing to compromised WordPress sites or disposable hosting, likely serving as landing pages for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://cructi.ru/uplcv?utm_term=fouad+whatsapp+v8+35+apk+download PDF link annotation
    • https://soportedevida.mx/ckfinder/userfiles/files/xumorakiguzaxivekijut.pdfIn PDF document text
    • http://swotaweb.org/img/upload/file/vifeneweparu.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/fajewiduwudidipareb.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/b67be506f7a796fdc5ae3c44fcd3198a/kakarax.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3a5a7b026---tesibedabaxuw.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/25591145443.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/pupubuvizapaf.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0fa7a7974e---35318763346.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/15196679122.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a350a2c73a5---37012777871.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870a03d41ea---25513300900.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/kopajowasilujimeli.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160726a7c6512f---zanukewira.pdfIn PDF document text
    • http://esejsc.com/upload/files/23098198882.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/48395551216.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/91470406900.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/85776788274.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/a21a2818c858aef16bfc5f871c588b80/24903116902.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/16668e2694f6169cbbc504a4f00f6d58/robukoxaja.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608446d1ba91d---55406845665.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/namikatidawudomev.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/texofakiwutitukajoduba.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_off0000dfc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DF 11000 bytes
SHA-256: 1b891598789fdb38f7a4ea708f830d914128a78a1444f2e880196f761856b0fa
font_02_sfnt_off0001117e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117E 18072 bytes
SHA-256: 72ea95b163966854fce6a489876011bdc5002b5e49ced531ebcb1f9bde2d7421
font_03_sfnt_off00013f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F54 16376 bytes
SHA-256: 0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855

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