Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c34ba4dd6e12e9…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 20:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7790886d4d7938cdb08572203ca6aa2c SHA-1: 830d8880fb6b23605a1a0bfef288ff5f99427726 SHA-256: 67c34ba4dd6e12e9976d70ac4eb34971e94a7db77e04ed18b7f6abeae6894015
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The presence of an embedded JavaScript stream suggests potential for further malicious actions, such as downloading additional payloads or redirecting the user to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://dimensionshoppe.com/alpha/ckfinder/userfiles/files/73153540391.pdf In PDF document text
    • http://lehnerkom.de/images/uploaded/file/banumonugavop.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/13638406680.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411b759ca49---depabagewejar.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/jolorikupakapemuzokedukuv.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b45c4ba04f---panufexo.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161415bf3cad59---kenizurotorepase.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/gopufineritowis.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/bilewobodumibasogux.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/balifapozekuj.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/nabigisodoka.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/7ed3022731cdabb86345590b5e3682a5/64624290066.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/18172470680.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/naledexabudoxaxegol.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/gejazivexek.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/nbbp8qlpeqokk4vsr2rnbm5u22/fikesoxeru.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/98493613971.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/sabaropujetezezopofuge.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/juratopukanovimu.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/4971746748.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/dedusafofawukefugevutipej.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/16281433097.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/73565042854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=the+babysitter+killer+queen+watch+onlinePDF 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_off0000d9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F5 10968 bytes
SHA-256: d911a9c5177b7a62affe135a81705620ae1feb4d3c41bfa215ad957c431054cd
font_01_sfnt_off0000f37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8E 17844 bytes
SHA-256: a2c420458324f46377f91c8731d6b725c4073f06c16e17bd23c09e0767d48645

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