Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2c31e71d8acde4c…

MALICIOUS

PDF

79.9 KB Created: 2021-09-07 07:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 92bc6e9a0dec08fab76f183cfaefab75 SHA-1: 91b269da343056678fe21cba56ae2323337d7db0 SHA-256: e2c31e71d8acde4cfa53abdfc297aa7f71b73d8c63971737395b600c59c8a9f6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/392o8n6ebttr9ppannpk54sc06/fusumivinibulurakiluda.pdf In PDF document text
    • http://dancedynamicsla.com/clients/38740/File/fefijod.pdfIn PDF document text
    • http://dhs1959reunion.com/clients/871764/File/64007021316.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/j1isl4m6mmkndb6d4o7ue9odr1/91375442527.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/wojunemene.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795c59d1a12---vipubajunamekuzikaweji.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/70968182155.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/devonijilud.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/56311776676.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/54255043299.pdfIn PDF document text
    • http://ativn.com/upload/file/dodutavus.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873d1211f30---65918562630.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/xewefurodavedasutigoxo.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/08/files/210801030531.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/sk8ge0t3d082goi3fbhjhpos2r/72881778933.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/marobivesega.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/58693543006.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/pijemafoximuvipatemoremiz.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-16/20210616003432683564.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afd82fc16ae---41967627340.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607337660d951---72881837407.pdfIn PDF document text
    • http://livestocktool.com/d/files/49864812401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=landmark+insights+pdfPDF 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_off0000d2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF4 10696 bytes
SHA-256: f2cb5fca93a8213df40a9e43d30c50d00a0235d8137dd09263b4cbd8bbee0ddd
font_02_sfnt_off000102f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F9 18096 bytes
SHA-256: b05b9fb15ba3cacc36d78c4aa6cdf42465c911f39db5a4aa68accb3b017ec8d0

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