Malicious PDF — malware analysis report

Static analysis result for SHA-256 b402738dda2230df…

MALICIOUS

PDF

79.7 KB Created: 2021-09-20 23:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9cac3a71c5c4e015f3a4f6c60a7a460e SHA-1: 11c00b8c941b53e9a47410cb6e1aaec1df82f1bf SHA-256: b402738dda2230dfb51281daf635758b99f78e433d61573e7fd50efcf9f748ce
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://noihoithanhtuan.com/media/ftp/file/najakedomuvisugapi.pdf In PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/devufenuposatoxasugezole.pdfIn PDF document text
    • https://sergeca.com.ve/ckfinder/userfiles/files/56673244118.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/wisositikunepeg.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/87392501270.pdfIn PDF document text
    • https://hinaweb.com/upload/file/89638676914.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/20693516478.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/61881109060.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/65564475519.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613686c0893d7---dijovutabiku.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/b0b126ed83a5c3555c7730e87fb4b752/defir.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/alb8vd29hhk4mn1eg7o1ju75t2/sefovupudiputej.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16138193abcd8d---24107727381.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/disuzalebojezid.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/21147186973.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/161466c1ed12a1---32608506511.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/wetofanaxetupovuritozuma.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/bosezesofojasu.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/gisil.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/30150942519.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/pidelixe.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/63548825664.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=watch+frozen+2+movie+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_off0000d02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02E 10672 bytes
SHA-256: 8d53764b956cf737a171f2a2e0bdd4ba51e49872d41bbf8ca17a35c9e91330fc
font_01_sfnt_off0000e88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88D 19352 bytes
SHA-256: 30b4e5a47bd9436258a0e911a2b363db34f7a59d738d9917362eeb8569429a87
font_02_sfnt_off0001196f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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