Malicious PDF — malware analysis report

Static analysis result for SHA-256 2240f1546357dfd5…

MALICIOUS

PDF

93.5 KB Created: 2021-08-03 13:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f6d249487cd1ff21112a6b480958a535 SHA-1: 1816c78271407a5da2954f9fb9e8549011c7cbf0 SHA-256: 2240f1546357dfd5b42cdbfaa640466010f51d054806b609e0268303f55f38dc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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 http://sattamatkapatti.com/userfiles/file/liwexiw.pdf In PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd5c09b97e---59268777030.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/feposa.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/31187302315.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/99959544537.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/muzajagewevarawazetimabok.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bccc905c46c---lanegixazejinexe.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/db95f2478be16b6dcef2ab5d2a86ba77/sasapuki.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160731f7f2f160---30624877837.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210520091747.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/32587370904.pdfIn PDF document text
    • https://genericdiabeticteststrips.com/userfiles/files/gafamumanidovomulorona.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/toriwanusukoviwijugidi.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/70745810288.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/natadazadiz.pdfIn PDF document text
    • http://drtamerturan.com/file/rapajamunokapejabeguva.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac70f10461---nikifepuvakuv.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/wivuvidudelupi.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/39010994940.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/mebelinetadugi.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f95ed462b4---pikejetadimetedugaruje.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/ef01df609d0e4b9813b4108276f5ac4b/52773025163.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/plmg5njf9uonmamdfr8aekj0f6/nuxokova.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/11687261994.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/abdfb7d663f0f3ce981bdc81af523be6/11878604953.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/57500aa905b4820a34f826d0812dd959/subabemiroxezuxupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+can+we+use+artificial+intelligence+in+educationPDF 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_off00010914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10914 10828 bytes
SHA-256: c93b664399c43370aba118cb30d9856a2c0d8e33ef13d74d30379811221ed794
font_01_sfnt_off000121ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A11 16840 bytes
SHA-256: 779a391e730555caccd9835301d2cc3a0fb96190b995fcc4467dd41690134c05

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