Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4407c4c8c3cbe8d…

MALICIOUS

PDF

82.8 KB Created: 2021-08-05 06:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 187589ab30f9fd6f7ff116098163060a SHA-1: 2e968cc4de7224fb32aba6925a25aebe696c8c25 SHA-256: c4407c4c8c3cbe8d37e2c09e1aa0d8fb72d4680c3466ccb26d3f2c59badc55ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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=filme+a+corrente+do+bem+dublado+completo+download PDF link annotation
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/92241807934.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd26762649---numomowamupugurebabidud.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/47588484016.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/74134202447.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/37801789164.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/50140828098.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/3da0e05cd65ee0707a54a1447c813dd8/93845642318.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16094aee6ef809---juxepilorikelagu.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1610b0c08753dc---pufudopakupiku.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/209n16l6l3odrd8hntk2as9rfs/4970738739.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/95160170285.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/tijivazuwivanakaruxekopu.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/b3869bf504d9adcbd49c7a87850477b0/69203115083.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/22821428909.pdfIn PDF document text
    • http://elyriacatholic1970.com/clients/7/79/79c6984f8945646ae1b55d50a6b4dbab/File/podusalutezowage.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/mebuzawepefis.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/satejinamakuv.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b32aa883392---33845272673.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/lenapi.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/11107838850.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d79c4c248---suramerapokazabakexov.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a577a6a0f---duresafupuja.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_off0000dc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC02 19204 bytes
SHA-256: 2e8e3c215c423af0c558b766994c6631db9f9c39883d96f4edc96961e631f960
font_01_sfnt_off00010bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC4 10812 bytes
SHA-256: 10c85d84bb1f91a1c4d8fecad5cecdba1f38ab5274d3c03c8dd55efa4f42820b
font_02_sfnt_off0001246f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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