Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff4dee0e6152e85…

MALICIOUS

PDF

80.2 KB Created: 2021-09-12 13:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5283b3cfa0b78b2e9ad610db9a35c9cb SHA-1: 7a569654f0be378bdf7ca2343099599ab60c8164 SHA-256: cff4dee0e6152e855f501d1e5e8e6074d580d99725025336cd13a630fef1e93c
172 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The heuristics indicate the document is a link farm, with many URLs pointing to compromised or disposable hosting, suggesting an attempt to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ccsl.asia/files/99724965490.pdf In PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/23662703140.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/juxumusuve.pdfIn PDF document text
    • http://belovosushi.ru/files/kokaroj.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/zagufitapoto.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210904152339.pdfIn PDF document text
    • http://ombs.ru/uploads/files/zinuraw.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/52993339325.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/to5422k07oepg5r761il6rdokp/28947469940.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9a09ed45f3630555d7e8acf0a0e89a8b/lakufapadurafamokomefuwi.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/79077841670.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/86225911485.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/gozimevu.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/92295930046.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/79429343587.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/80301304656.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613328df36bbc---xixije.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/gabusamonafonosalidopu.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396df80d463---81982850342.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/pexaketixafawuxid.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/45073895345.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/5042400867.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=scanned+pdf+to+editable+excel+converter+online+freePDF 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_off0000d520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD520 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED32 17120 bytes
SHA-256: 476cdb65d53f18104ec1298b41916a7f66e91b214b277e192004268e6665047a
font_02_sfnt_off0001197c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197C 10828 bytes
SHA-256: 86fa149121d3ffbb76ba7318dfe0c23371b802272e539fa226142f3eda3078be

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