Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b925439a0fbd441…

MALICIOUS

PDF

82.9 KB Created: 2021-09-16 18:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2009ad755e001b10cf7cd5e38fa66983 SHA-1: e0fd1c1ffbbcc4ae7d99ee98dd858d2a3311d143 SHA-256: 9b925439a0fbd441ccb8aa9e6faa8897e92fea92630f0bcf5c57486a82510fb3
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads. The presence of numerous links, including those pointing to compromised CMS upload storage and disposable hosting, along with a heuristic indicating a download button lure, strongly suggests a phishing or social engineering attack. The ML classifier and ClamAV detection further corroborate the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=pokemon+super+fire+red+zip+file+download PDF link annotation
    • http://vietsonplastic.com/uploads/userfiles/file/rigiget.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/tinat.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/87280525102.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/tekivapafimoxapivixo.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613567f26f20a---14804288381.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16142bad56d444---54596775445.pdfIn PDF document text
    • http://lulanjina.net/upload/files/1163405936.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/32978079315.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/xirukoke.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/52837331823.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/82042599943.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/gipivawoxafobumike.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/43491424457.pdfIn PDF document text
    • https://anjingliar.com/contents/files/99986623982.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/92491377777.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/vozuguvadekeniwenukeposav.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/16694118877.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/napasexigajemudaju.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/pevases.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/ligoxabu.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fca6092f2b---gufexeseputozegilowase.pdfIn PDF document text
    • http://deforma.it/userfiles/files/wepanopinozufukixiketesup.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/tididuluwija.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/lituz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD819 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02B 19864 bytes
SHA-256: 5095fae1ecbe4f37f04370882477fd3bbc9753344ece9157eadf4cb9b049cf7a
font_02_sfnt_off00012439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12439 10900 bytes
SHA-256: b32e40535be082e5fd65b5a5a1c96212b78247e40c031e9aed77f79e3d5b745c

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