Malicious PDF — malware analysis report

Static analysis result for SHA-256 9badf5c5aaf4b437…

MALICIOUS

PDF

73.2 KB Created: 2021-09-21 07:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f2a33627fd15278bbfeee2706c702a5d SHA-1: e990fc66b93e748c6ed7dc3a65f36a2f6ed926d2 SHA-256: 9badf5c5aaf4b4378f0f43bb271fd5d20c48040fb33bd239426d0e120604efc9
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are commonly used to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://smidgel.ru/uplcv?utm_term=cute+android+18 PDF link annotation
    • http://etkenkalip.com/files/mijeton.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/84766610164.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/kuviso.pdfIn PDF document text
    • http://szaniterplaza.hu/ckfinder/userfiles/files/79686915210.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/5926719690.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/zixilulijorabilazosewibij.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/bilepulirokukumepig.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/nenoxosajepasorefovo.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210914043256735188fbu33.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/rebonogigadamam.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/48730298717.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/xozugekiwosekurogemewolup.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210911050909.pdfIn PDF document text
    • http://www.puhito.hu/uploads/16909919995.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614294f5073ec---11145920120.pdfIn PDF document text
    • http://gardatrans.com/content/Files/15893599417.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/35qj33norkcetrl3qaa3d4kvm5/33130084839.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/wajilosejixuz.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16148f608f1c2c---faxometilabo.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/nemawurowozo.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/37278651772.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/26447194660.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/dalavav.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/betusivepet.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/xazeviwenutudinazoru.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_off0000baa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA0 10420 bytes
SHA-256: ba6601552f24909618ec2710b6cac80a67a1ee5291700b1f9325779a1a153eba
font_01_sfnt_off0000d26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7F 17276 bytes
SHA-256: 75ccd9b33c7a5ae64c4d9d435895ffa049535be457b1cd17d66588f6858b232c

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