Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b478e900bc3d5a…

MALICIOUS

PDF

81.6 KB Created: 2021-09-07 12:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4659439ff82bc056e2c228043a20d448 SHA-1: a0d6eac0d15d0b42079bfbed9597e629a5b0d676 SHA-256: 82b478e900bc3d5a084d5cf7291fe17534271a4522eaa046997824b1137e9874
184 Risk Score

Malware Insights

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

The sample is a PDF that impersonates a cloud document lure, aiming to trick the user into opening it. It contains embedded JavaScript, indicating an attempt to exploit vulnerabilities or execute malicious code. The numerous external URLs suggest a link farm designed to redirect users to malicious content or phishing sites.

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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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 https://queure.ru/uplcv?utm_term=cara+edit+pdf+ke+word+di+iphone PDF link annotation
    • https://kitapkaplama.com/upload/ckfinder/files/memixede.pdfIn PDF document text
    • http://euhoca.com/js/ckfinder/userfiles/files/8494691171.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0c825dc9b---75411980912.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/sunesuwavurug.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/demuzuxeponaxesas.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/mizupunudafatoto.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/fegosagopiteduj.pdfIn PDF document text
    • https://tipresentoio.it/images/file/86195861677.pdfIn PDF document text
    • http://15thstpresbyterian.org/clients/d/d7/d7025cfb1d4df99eee5a588ecc3dd57f/File/16868037299.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/ibeei0o2inhp9peobh0a0uh7jv/dogekudadeso.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/42652216180.pdfIn PDF document text
    • https://lesura.net/userfiles/file/paginedilaxamorudul.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609984bdd73c3---zunademusevowexexul.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202108091956130656.pdfIn PDF document text
    • https://aedwea.com/upload/foto/54555986939.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/cb5aa77ek67143usa6pdmq16ij/49523558569.pdfIn PDF document text
    • http://billsky.ee/files/file/vofedelozuzixuvimisuzotu.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/jbcldg3thfctklqnc337mmulvk/guxunidavuzakuwebib.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/f0deada77cf125ac40cef319a213bac8/kigewimodafu.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/revabisagabu.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/c6f90b846bdfa5c88267fc25878f0d24/jakafebabebanulowelimotuz.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/snqa48h63p3r056hvniat4qc53/vopurezuvoganetuxonone.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_off0000de98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE98 10592 bytes
SHA-256: 21fc4b03944944cc5e54739be42ab39043af849af39bf9a04d4a42aa746d08e3
font_01_sfnt_off0000f6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED7 16244 bytes
SHA-256: b7400eaae3c51954488d307b079c148c3871af826a7e48ca3df0f3fc4b37ee36

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